Finn and Jake learned during the events of "Holly Jolly Secrets" that the Ice King was originally a human antiquarian named Simon Petrikov who bought his crown from a dock worker in northern Scandinavia, predating the Mushroom War. Wearing the crown, Petrikov began to lose both his mind and then his fiancée Betty; this explains his subconscious need for princesses. He soon began deteriorating in both mind and body over the years into his current state. Sometime before the Mushroom War he also discovered the Enchiridion. 996 years prior to the events of the series and directly after the Mushroom War, he met, befriended and cared for young Marceline. Eventually, he realized that his deteriorating mind and behavior would possibly become a threat to young Marceline. Thus, he wrote a letter to Marceline, describing why he could not help her anymore and imploring her to forgive him for whatever wrong he might do with the crown possessing him.
A character named "Mr. M," also voiced by Stephen Root, appears in "BMO," the first episode of Adventure Time: Distant Lands. Although it is never stated in the episode, Mr. M is heavily implied to be Martin: besides having a similar build, Mr. M shares Martin's selfish tendencies, his views on parenthoods, and even says the exact same lines such as "here comes the rascal" and "I gotta get outta here!" The episode is set prior to the events of the main series and offers information on what happened between when he left Finn and when he was imprisoned in the Cosmic Citadel. When asked by a fan to confirm his identity, Adventure Time showrunner Adam Muto remarked, "That sounds like an unsubstantiated rumor."
GOLB is the embodiment of chaos, capable of corrupting and fusing creatures into monsters or erasing people from existence altogether. He was first introduced in the episode "Puhoy", when he is briefly glimpsed by Finn as he returns to Ooo from the Pillow World. In the episode "You Forgot Your Floaties", it is revealed that at one point, he attacked Mars and wiped Magic Man's wife, Margles, from existence. This catastrophe set off a series of events that eventually culminated in Magic Man losing his sanity. GOLB is so powerful that not even the wish magic of Prismo could bring Margles back. It is also known that the Lich claimed to be "the last scholar of GOLB".
During the sixth season, Gunter the penguin is revealed be a primordial space demon named Orgalorg, who desired to absorb the catalyst comet. Orgalorg ended up in his current state after being defeated by Grob Gob Glob Grod and exiled to early Earth. The planet's gravity condensed Orgalorg into his current powerless and amnesiac penguin-like form as he wandered the planet for ages before he was found by the Ice King. Regardless of the memory loss, Gunter accidentally regains his memories and orchestrates a series of events to use the dethroned Bubblegum's spaceship to assume his true form and absorb a catalyst comet. He is defeated by Finn regressing back to his weakened state. Gunther later acquires Ice King's crown in the series finale. While Jake worries he'll use it to become Orgalorg again, he instead merges with the crown, becoming the Ice Thing. He ends taking Simon's place as the ruler of the Ice Kingdom and marries Turtle Princess. The glimpses into the future shown in "Graybles 1000+", "Come Along with Me" and Fionna and Cake reveal that Ice Thing ended up outliving Turtle Princess, eventually turning into an insane beast under the crown's influence. He appears to be an enemy of Jake's descendants for unknown reasons.
The character's name has been pronounced a variety of ways, including /ɡʌntər/, /ɡuːntər/, and /ɡʌnθər/; this is because in the original script, the name was spelled Günter, with an umlaut over the u, causing Kenny to use the proper German pronunciation. When the umlaut was dropped, Kenny switched to a different name. In order to justify this discrepancy, the crew rationalized that there were many penguins with similar sounding names.
Orange, B. Alan. "SDCC 2011 Exclusive: Adventure Time Cast Interviews". Movie Web. Archived from the original on September 20, 2011. Retrieved August 20, 2011. https://web.archive.org/web/20110920120148/http://www.movieweb.com/comic-con/2011/news/sdcc-2011-exclusive-adventure-time-cast-interviews
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Handlen, Zack (June 5, 2012). "Review: Adventure Time: 'Goliad'". The A.V. Club. The Onion. Retrieved January 22, 2013. https://www.avclub.com/adventure-time-goliad-1798173036
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Salaff, Andres et al. (supervising directors); Sandra Lee (art director); Tom Herpich, et al. (storyboard artists) (November 16–19, 2015). "Stakes". Adventure Time. Season 7. Episode 6–13. Cartoon Network. /wiki/Cartoon_Network
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Wolfhard, Steve (director); Iggy Craig, Graham Falk, Jim Campbell, & Lucyola Langi (writer and storyboards) (September 7, 2023). "Prismo the Wishmaster". Adventure Time: Fionna and Cake. Season 1. Episode 4. Max.
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Shannon, Ryan (director); Hanna K. Nyström, Anna Syvertsson, Jacob Winkler, & Haewon Lee (writer and storyboards) (August 31, 2023). "Fionna Campbell". Adventure Time: Fionna and Cake. Season 1. Episode 1. Max.
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Cash, Nate (supervising director); Nick Jennings (art director); Jesse Moynihan & Ako Castuera (storyboard artists) (February 25, 2013). "Betty". Adventure Time. Season 5. Episode 48. Cartoon Network. /wiki/Cartoon_Network
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Muto, Adam (supervising director); Sandra Lee (art director); Hanna K. Nyström & Andres Salaff (storyboard artists) (January 15, 2016). "King's Ransom". Adventure Time. Season 7. Episode 21. Cartoon Network. /wiki/Adventure_Time
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Leichliter, Larry (director); Patrick McHale & Cole Sanchez (creative directors); Nick Jennings (art director); Kent Osborne & Somvilay Xayaphone (storyboard artists) (October 18, 2010). "The Eyes". Adventure Time. Season 2. Episode 2. Cartoon Network. /wiki/Cartoon_Network
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Chanliau, Pierre (September 4, 2023). "'That Is Ridiculous': Kumail Nanjiani Is Not Happy He Got Recast In Adventure Time: Fionna & Cake". The Direct. Retrieved September 4, 2023. https://thedirect.com/article/adventure-time-fionna-cake-kumail-nanjiani-recast
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Wolfhard, Steve (director); Iggy Craig, Graham Falk, Jim Campbell, & Lucyola Langi (writer and storyboards) (September 7, 2023). "Prismo the Wishmaster". Adventure Time: Fionna and Cake. Season 1. Episode 4. Max.
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Ito, Elizabeth (supervising director); Sandra Lee (art director); Tom Herpich & Steve Wolfhard (storyboard artists) (November 19, 2016). "Reboot". Adventure Time. Season 8. Episode 13. Cartoon Network. /wiki/Cartoon_Network
Sanchez, Cole (supervising director); Sandra Lee (art director); Tom Herpich & Steve Wolfhard (storyboard artists) (January 23, 2017). "Two Swords". Adventure Time. Season 8. Episode 14. Cartoon Network. /wiki/Cartoon_Network
Sanchez, Cole (supervising director); Sandra Lee (art director); Laura Knetzger & Emily Partridge (storyboard artists) (January 23, 2017). "Do No Harm". Adventure Time. Season 8. Episode 15. Cartoon Network. /wiki/Cartoon_Network
Sanchez, Cole (supervising director); Sandra Lee (art director); Sam Alden & Polly Guo (storyboard artists) (July 20, 2017). "Whispers". Adventure Time. Season 9. Episode 13. Cartoon Network. /wiki/Cartoon_Network
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Sava, Oliver (February 11, 2014). "Review: Adventure Time: 'The Red Throne'". The A.V. Club. The Onion. Retrieved February 17, 2014. https://www.avclub.com/adventure-time-the-red-throne-1798179473
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Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Luther McLaurin & Armen Mirzaian (storyboard artists) (June 14, 2010). "What is Life?". Adventure Time. Season 1. Episode 15. Cartoon Network. /wiki/Cartoon_Network
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Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Luther McLaurin & Armen Mirzaian (storyboard artists) (June 14, 2010). "What is Life?". Adventure Time. Season 1. Episode 15. Cartoon Network. /wiki/Cartoon_Network
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Sava, Oliver (August 6, 2012). "Review: Adventure Time: 'BMO Noire'". The A.V. Club. The Onion. Retrieved March 3, 2013. https://www.avclub.com/adventure-time-bmo-noire-1798173755
Sava, Oliver (May 12, 2014). "Review: Adventure Time: 'Sad Face'". The A.V. Club. The Onion. Retrieved June 1, 2014. https://www.avclub.com/adventure-time-sad-face-1798180442
Sava, Oliver (June 19, 2014). "Review: Adventure Time: 'Furniture & Meat'". The A.V. Club. The Onion. Retrieved January 16, 2015. https://www.avclub.com/adventure-time-furniture-meat-1798180724
Sava, Oliver (November 26, 2014). "Review: Adventure Time: 'Jake the Brick'". The A.V. Club. The Onion. Retrieved January 16, 2015. https://www.avclub.com/adventure-time-jake-the-brick-1798182204
Clark, Noelene (February 13, 2013). "'Adventure Time' Actor Tom Kenny on Ice King's Loneliness, Tragic Past". Los Angeles Times. Retrieved February 24, 2013. http://herocomplex.latimes.com/tv/adventure-time-actor-tom-kenny-on-ice-kings-loneliness-tragic-past/#/0
Clark, Noelene (February 13, 2013). "'Adventure Time' Actor Tom Kenny on Ice King's Loneliness, Tragic Past". Los Angeles Times. Retrieved February 24, 2013. http://herocomplex.latimes.com/tv/adventure-time-actor-tom-kenny-on-ice-kings-loneliness-tragic-past/#/0
Leichliter, Larry (director); Adam Muto (creative director); Nick Jennings (art director); Bert Youn & Somvilay Xayaphone (storyboard artists) (May 28, 2012). "Princes Monster Wife". Adventure Time. Season 4. Episode 9. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (January 15, 2015). "Review: Adventure Time: 'Evergreen'". The A.V. Club. The Onion. Retrieved January 16, 2015. https://www.avclub.com/adventure-time-evergreen-1798182421
Sava, Oliver (June 3, 2015). "Review: Adventure Time: "Orgalorg"". The A.V. Club. The Onion. Retrieved June 4, 2015. https://www.avclub.com/adventure-time-orgalorg-1798183981
Clark, Noelene (February 13, 2013). "'Adventure Time' Actor Tom Kenny on Ice King's Loneliness, Tragic Past". Los Angeles Times. Retrieved February 24, 2013. http://herocomplex.latimes.com/tv/adventure-time-actor-tom-kenny-on-ice-kings-loneliness-tragic-past/#/0
Livingston, Polly Lou (Actress). 2012. "Tree Trunks" [Commentary track], Adventure Time Season One [DVD], Los Angeles, CA: Cartoon Network. /wiki/Cartoon_Network
Ward, Bettie (Artist). 2012. "Tree Trunks" [Commentary track], Adventure Time Season One [DVD], Los Angeles, CA: Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Bert Youn & Sean Jimenez (storyboard artists) (April 12, 2010). "Tree Trunks". Adventure Time. Season 1. Episode 4. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Bert Youn & Sean Jimenez (storyboard artists) (April 12, 2010). "Tree Trunks". Adventure Time. Season 1. Episode 4. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Patrick McHale & Cole Sanchez (creative directors); Nick Jennings (art director); Cole Sanchez & Jesse Moynihan (storyboard artists) (November 29, 2010). "Crystals Have Power". Adventure Time. Season 2. Episode 8. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Patrick McHale & Cole Sanchez (creative directors); Nick Jennings (art director); Cole Sanchez & Jesse Moynihan (storyboard artists) (November 29, 2010). "Crystals Have Power". Adventure Time. Season 2. Episode 8. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Nick Jennings (art director); Bert Youn & Tom Herpic (storyboard artists) (October 3, 2011). "Apple Wediing". Adventure Time. Season 3. Episode 11. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (April 23, 2012). "Review: Adventure Time: 'Dream of Love'". The A.V. Club. The Onion. Retrieved January 24, 2013. https://www.avclub.com/adventure-time-dream-of-love-1798172513
Sava, Oliver (April 21, 2014). "Review: Adventure Time: 'Wake Up'/'Escape from the Citadel'". The A.V. Club. The Onion. Retrieved January 5, 2015. https://www.avclub.com/adventure-time-wake-up-escape-from-the-citadel-1798180328
Stopera, Dave (2012). "25 Actors You Might Not Have Known Did Voices On 'Adventure Time'". BuzzFeed. BuzzFeed Inc. Retrieved January 14, 2013. https://www.buzzfeed.com/daves4/25-actors-you-might-not-have-known-did-voices-on
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Kent Osborne, Niki Yang, & Adam Muto (storyboard artists) (September 20, 2010). "His Hero". Adventure Time. Season 1. Episode 25. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Kent Osborne, Niki Yang, & Adam Muto (storyboard artists) (September 20, 2010). "His Hero". Adventure Time. Season 1. Episode 25. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Nate Cash (supervising director); Nick Jennings (art director); Tom Herpich & Skyler Page (storyboard artists) (November 12, 2012). "Finn the Human". Adventure Time. Season 5. Episode 1. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (October 22, 2012). "Review: Adventure Time: 'The Lich'". The A.V. Club. The Onion. Retrieved January 24, 2013. https://www.avclub.com/adventure-time-the-lich-1798174698
Sava, Oliver (March 17, 2014). "Review: Adventure Time: 'Billy's Bucket List'". The A.V. Club. The Onion. Retrieved March 30, 2014. https://www.avclub.com/adventure-time-billys-bucket-list-1798179814
"Adventure Time". Behind the Voice Actors. Retrieved January 14, 2013. Note: To reveal who voiced what character, one must click on the various characters under "Guest Stars" to reveal their voice actor or actress. http://www.behindthevoiceactors.com/tv-shows/Adventure-Time/
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Adam Muto & Rebecca Sugar (storyboard artists) (March 7, 2011). "Susan Strong". Adventure Time. Season 2. Episode 18. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Cole Sanchez (creative director); Nick Jennings (art director); Adam Muto & Rebecca Sugar (storyboard artists) (November 7, 2011). "Beautopia". Adventure Time. Season 3. Episode 14. Cartoon Network. /wiki/Cartoon_Network
Muto, Adam (supervising director); Nick Jennings (art director); Sloane Leong & Adam Muto (storyboard artists) (February 19, 2015). "Dark Purple". Adventure Time. Season 6. Episode 29. Cartoon Network. /wiki/Cartoon_Network
Muto, Adam (supervising director); Sandra Lee (art director); Adam Muto & Aleks Sennwald (storyboard artists) (November 19, 2016). "Preboot". Adventure Time. Season 8. Episode 12. Cartoon Network. /wiki/Cartoon_Network
Ito, Elizabeth (supervising director); Sandra Lee (art director); Tom Herpich & Steve Wolfhard (storyboard artists) (November 19, 2016). "Reboot". Adventure Time. Season 8. Episode 13. Cartoon Network. /wiki/Cartoon_Network
Ito, Elizabeth, et al. (supervising directors); Sandra Lee (art director); Sam Alden, et al. (storyboard artists) (January 30, 2016 – February 2, 2017). "Islands". Adventure Time. Season 8. Episode 20–27. Cartoon Network. /wiki/Cartoon_Network
"Adventure Time". Behind the Voice Actors. Retrieved January 14, 2013. Note: To reveal who voiced what character, one must click on the various characters under "Guest Stars" to reveal their voice actor or actress. http://www.behindthevoiceactors.com/tv-shows/Adventure-Time/
Leichliter, Larry (director); Cole Sanchez (creative director); Nick Jennings (art director); Ako Castuera & Jesse Moynihan (storyboard artists) (August 29, 2011). "Wizard Battle". Adventure Time. Season 3. Episode 8. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (July 1, 2013). "Review: Adventure Time: 'Wizards Only, Fools'". The A.V. Club. The Onion. Retrieved August 22, 2014. https://www.avclub.com/adventure-time-wizards-only-fools-1798177248
Sava, Oliver (November 4, 2013). "Review: Adventure Time: 'Play Date'". The A.V. Club. The Onion. Retrieved August 22, 2014. https://www.avclub.com/adventure-time-play-date-1798178558
Sava, Oliver (July 24, 2014). "Review: Adventure Time: 'Thanks for the Crabapples, Giuseppe'". The A.V. Club. The Onion. Retrieved August 22, 2014. https://www.avclub.com/adventure-time-thanks-for-the-crabapples-giuseppe-1798180978
Cash, Nate (supervising director); Nick Jennings (art director); Jesse Moynihan & Thomas Wellmann (storyboard artists) (July 1, 2013). "Wizards Only Fools". Adventure Time. Season 5. Episode 26. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (March 12, 2016). "Attraction comes and goes for Finn on a delightful Adventure Time". The A.V. Club. Retrieved September 20, 2017. https://www.avclub.com/attraction-comes-and-goes-for-finn-on-a-delightful-adve-1798186957
"Behind the Voice Actors - Olivia Olson". Behind the Voice Actors. Retrieved September 10, 2023. https://www.behindthevoiceactors.com/Olivia-Olson/
Leichliter, Larry (director); Cole Sanchez (creative director); Nick Jennings (art director); Ako Castuera & Jesse Moynihan (storyboard artists) (August 29, 2011). "Wizard Battle". Adventure Time. Season 3. Episode 8. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (March 12, 2016). "Attraction comes and goes for Finn on a delightful Adventure Time". The A.V. Club. Retrieved September 20, 2017. https://www.avclub.com/attraction-comes-and-goes-for-finn-on-a-delightful-adve-1798186957
Sava, Oliver (September 17, 2017). "Adventure Time drops four episodes that highlight the scope of the series". The A.V. Club. Retrieved September 20, 2017. https://www.avclub.com/adventure-time-drops-four-episodes-that-highlight-the-s-1818498647
"Adventure Time". Behind the Voice Actors. Retrieved January 14, 2013. Note: To reveal who voiced what character, one must click on the various characters under "Guest Stars" to reveal their voice actor or actress. http://www.behindthevoiceactors.com/tv-shows/Adventure-Time/
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Pendleton Ward & Tom Herpich (storyboard artists) (July 26, 2010). "Freak City". Adventure Time. Season 1. Episode 17. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (July 23, 2012). "Review: Adventure Time: 'Sons of Mars'". The A.V. Club. The Onion. Retrieved February 6, 2013. https://www.avclub.com/adventure-time-son-of-mars-1798173574
Sava, Oliver (June 1, 2015). "Review: Adventure Time: 'You Forgot Your Floaties'". The A.V. Club. The Onion. Retrieved June 4, 2015. https://www.avclub.com/adventure-time-you-forgot-your-floaties-1798183951
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Pendleton Ward & Tom Herpich (storyboard artists) (July 26, 2010). "Freak City". Adventure Time. Season 1. Episode 17. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (July 23, 2012). "Review: Adventure Time: 'Sons of Mars'". The A.V. Club. The Onion. Retrieved February 6, 2013. https://www.avclub.com/adventure-time-son-of-mars-1798173574
Moynihan, Jesse (July 20, 2012). "Adventure Time Update". JesseMoynihan.com. Retrieved February 6, 2013. http://jessemoynihan.com/?p=1676
Sava, Oliver (December 4, 2012). "Review: Adventure Time: 'All the Little People'". The A.V. Club. The Onion. Retrieved February 6, 2013. https://www.avclub.com/adventure-time-all-the-little-people-1798175175
Sava, Oliver (November 24, 2014). "Review: Adventure Time: 'Everything's Jake'". The A.V. Club. The Onion. Retrieved January 16, 2015. https://www.avclub.com/adventure-time-everything-s-jake-1798182044
Sava, Oliver (September 9, 2013). "Review: Adventure Time: 'Time Sandwich'". The A.V. Club. The Onion. Retrieved April 22, 2014. https://www.avclub.com/adventure-time-time-sandwich-1798177903
Sava, Oliver (June 1, 2015). "Review: Adventure Time: 'You Forgot Your Floaties'". The A.V. Club. The Onion. Retrieved June 4, 2015. https://www.avclub.com/adventure-time-you-forgot-your-floaties-1798183951
Sava, Oliver (May 13, 2016). "Review: Adventure Time: 'Normal Man'". The A.V. Club. The Onion. Retrieved August 15, 2017. https://www.avclub.com/normal-man-makes-up-for-past-sins-on-an-apologetic-adve-1798187767
Leichliter, Larry (director); Nate Cash (creative director); Nick Jennings (art director); Ako Castuera & Jesse Moynihan (storyboard artists) (July 23, 2012). "Sons of Mars". Adventure Time. Season 4. Episode 15. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (July 23, 2012). "Review: Adventure Time: 'Sons of Mars'". The A.V. Club. The Onion. Retrieved February 6, 2013. https://www.avclub.com/adventure-time-son-of-mars-1798173574
Sava, Oliver (January 22, 2015). "Review: Adventure Time: 'Astral Plane'". The A.V. Club. The Onion. Retrieved January 23, 2015. https://www.avclub.com/adventure-time-astral-plane-1798182496
Sava, Oliver (May 13, 2016). "Review: Adventure Time: 'Normal Man'". The A.V. Club. The Onion. Retrieved August 15, 2017. https://www.avclub.com/normal-man-makes-up-for-past-sins-on-an-apologetic-adve-1798187767
Ristaino, Andy (May 8, 2012). "Was Ron Perlman voicing the Lich at the end of In Your Footsteps?". Formspring. Archived from the original on May 29, 2013. Retrieved January 30, 2013. https://web.archive.org/web/20130529075422/http://www.formspring.me/skronked/q/324089489322437247
"'Adventure Time' creator talks '80s". USA Today. Gannett Company. November 1, 2012. Retrieved November 7, 2012. https://www.usatoday.com/story/popcandy/2012/11/01/adventure-time-creator-talks-80s/1672583/
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Rebecca Sugar & Adam Muto (storyboard artists) (May 2, 2011). "Mortal Folly". Adventure Time. Season 2. Episode 25. Cartoon Network. /wiki/Cartoon_Network
Leichliter, Larry (director); Patrick McHale (creative director); Nick Jennings (art director); Cole Sanchez & Jesse Moynihan (storyboard artists) (May 2, 2011). "Mortal Recoil". Adventure Time. Season 2. Episode 26. Cartoon Network. /wiki/Cartoon_Network
Sava, Oliver (October 22, 2012). "Review: Adventure Time: 'The Lich'". The A.V. Club. The Onion. Retrieved January 24, 2013. https://www.avclub.com/adventure-time-the-lich-1798174698