In February 2021, Tomlin was hired to write to be the showrunner for an anime series based on the Terminator franchise, to be produced by Netflix, Skydance, and Production I.G, titled Terminator Zero. In October 2021, Tomlin was writing the live-action film adaptation of BRZRKR. In 2021, Tomlin wrote the comic book series Batman: The Imposter for DC Comics, alongside artist Andrea Sorrentino and with variant covers by artist Lee Bermejo. In August 2022, it was announced Tomlin would co-write the sequel to The Batman with Matt Reeves. In September 2022, it was announced that Tomlin would write a three-issue maxiseries for Boom! Studios entitled A Vicious Circle, with Lee Bermejo serving as artist, and publication beginning in December 2022. In 2023, the first issue of A Vicious Circle was nominated for multiple Eisner awards. In April 2025, he scripted a John Wick spinoff film, centered around Caine.
Tomlin, Mattson [@mattsontomlin] (July 16, 2020). "Bizarrely, I am 30 today" (Tweet). Archived from the original on July 24, 2022. Retrieved December 20, 2022 – via Twitter.
Couch, Aaron (August 14, 2020). "How 'The Batman' and 'Project Power' Scribe Mattson Tomlin Became One of Hollywood's Busiest Screenwriters". The Hollywood Reporter. Retrieved September 6, 2021. https://www.hollywoodreporter.com/movies/movie-features/how-project-power-writer-mattson-tomlin-made-it-hollywood-1306780/
Williams, Trey (September 20, 2018). "Joseph Gordon-Levitt and Jamie Foxx to Co-Star in Untitled Netflix Sci-Fi". TheWrap. Retrieved November 28, 2019. https://www.thewrap.com/joseph-gordon-levitt-jamie-foxx-untitled-netflix-sci-fi/
D'Alessandro, Anthony (September 20, 2018). "Jamie Foxx & Joseph Gordon-Levitt Join Netflix's Untitled Henry Joost-Ariel Schulman Sci-Fi Feature". Deadline Hollywood. Penske Media Corporation. Retrieved November 30, 2019. https://deadline.com/2018/09/jamie-foxx-joseph-gordon-levitt-join-netflix-untitled-sci-fi-movie-1202468185/
D'Alessandro, Anthony (September 27, 2018). "Jamie Foxx & Joseph Gordon-Levitt Netflix Sci-Fi Movie Finds Female Lead In 'The Deuce's Dominique Fishback". Deadline Hollywood. Penske Media Corporation. Retrieved November 30, 2019. https://deadline.com/2018/09/jamie-foxx-joseph-gordon-levitt-netflix-movie-dominique-fishback-female-lead-the-hate-u-give-1202472510/
Kit, Borys (March 6, 2019). "Olivia Cooke, Jack O'Connell to Star in High-Concept Sci-Fi Love Story 'Little Fish' (Exclusive)". The Hollywood Reporter. Valence Media. Retrieved November 28, 2019. https://www.hollywoodreporter.com/heat-vision/olivia-cooke-jack-oconnell-star-sci-fi-film-little-fish-1192710
D'Alessandro, Anthony (October 14, 2019). "'The Batman' Finds Its Selina Kyle In Zoë Kravitz". Deadline Hollywood. Penske Media Corporation. Retrieved November 28, 2019. https://deadline.com/2019/10/the-batman-finds-its-selina-kyle-in-zoe-kravitz-1202759926/
Grater, Tom (January 28, 2020). "Robert Pattinson's 'The Batman' Starts London Shoot". Deadline Hollywood. Penske Media Corporation. Retrieved February 11, 2020. https://deadline.com/2020/01/robert-pattinsons-batman-london-shoot-1202843775/
Kit, Borys (January 22, 2020). "Seth Rogen, David F. Sandberg Tackling Rick Remender's 'Fear Agent' for Amazon (Exclusive)". The Hollywood Reporter. Valence Media. Retrieved January 22, 2020. https://www.hollywoodreporter.com/heat-vision/seth-rogen-david-f-sandberg-tackling-rick-remenders-fear-agent-1271777
Fleming, Mike Jr. (January 28, 2020). "Lionsgate Buying Graphic Horror Novel 'Memetic' For 'The Batman' Co-Writer Mattson Tomlin To Script; Point Grey & Boom! Studios Producing". Deadline Hollywood. Penske Media Corporation. Retrieved February 11, 2020. https://deadline.com/2020/01/memetic-movie-mattson-tomlin-lionsgate-boom-studios-point-grey-1202844039/
"New Mega Man Movie Details Revealed". https://comicbook.com/gaming/news/mega-man-movie-mattson-tomlin-quotes/
Gonzalez, Umberto (May 5, 2020). "'The Batman' Co-Writer Sells Sci-Fi Spec Script '2084' to Paramount". TheWrap. Retrieved May 5, 2020. https://www.thewrap.com/the-batman-co-writer-2084-paramount/
"Mattson Tomlin, Chloe Grace Moretz Team for Sci-Fi Tale 'Mother/ Android' (Exclusive)". The Hollywood Reporter. September 3, 2020. Retrieved October 14, 2020. https://www.hollywoodreporter.com/heat-vision/the-batman-writer-mattson-tomlin-chloe-grace-moretz-team-for-sci-fi-tale-mother-android-exclusive
N'Duka, Amanda (September 21, 2020). "'Euphoria's Algee Smith To Co-Star Opposite Chloe Grace Moretz In 'Mother/Android' Sci-Fi At Miramax". Deadline Hollywood. Retrieved October 14, 2020. https://deadline.com/2020/09/algee-smith-chloe-grace-moretz-mother-android-miramax-1234581400/
"Raúl Castillo Joins Chloe Grace Moretz and Algee Smith for Cast of Miramax's Mother/Android". PR Newswire. September 25, 2020. Retrieved October 14, 2020. https://www.prnewswire.com/news-releases/raul-castillo-joins-chloe-grace-moretz-and-algee-smith-for-cast-of-miramaxs-motherandroid-301138414.html
Nakamura, Reid (February 26, 2021). "'Terminator' Anime Series in the Works at Netflix". TheWrap. Retrieved February 26, 2021. https://www.thewrap.com/terminator-anime-series-in-the-works-at-netflix/
Weintraub, Steve (October 4, 2021). "Keanu Reeves, Matt Kindt, and Ron Garney Discuss Their Comic Series 'BRZRKR' and Reveal Who's Writing the Live-Action Netflix Movie". Collider. Retrieved February 22, 2022. Reeves told me that Mattson Tomlin (writer of Project Power and one of the writers on The Batman) has been hired to write the live-action movie and it's in the early stages of development. https://collider.com/keanu-reeves-brzrkr-netflix-movie-interview/
Couch, Aaron (February 22, 2022). "'Batman: The Imposter' Writer Mattson Tomlin Hasn't Let The Dark Knight Go". The Hollywood Reporter. Archived from the original on February 22, 2022. Retrieved February 25, 2022. https://www.hollywoodreporter.com/movies/movie-news/batman-the-imposter-mattson-tomlin-1235097029/
"Batman: The Imposter (2021)". Comicscored.com. Comicscored. Retrieved May 28, 2022. https://comicscored.com/volumes/batman-the-imposter-2021/
Kit, Borys (August 23, 2022). "'The Batman 2': Mattson Tomlin to Co-Write Script With Matt Reeves". The Hollywood Reporter. Retrieved August 24, 2022. https://www.hollywoodreporter.com/movies/movie-news/the-batman-2-mattson-tomlin-to-write-matt-reeves-1235203669/
Kit, Borys (September 14, 2022). "'Batman' Writer Mattson Tomlin, Artist Lee Bermejo Team for Time Traveling Assassin Story 'A Vicious Circle' (Exclusive)". The Hollywood Reporter. Retrieved December 19, 2022. https://www.hollywoodreporter.com/movies/movie-news/mattson-tomlin-lee-bermejo-team-a-vicious-circle-1235220564/
"BOOM! Studios Celebrates 2023 Eisner Nominations". BOOM! Studios. May 18, 2023. Retrieved December 28, 2023. https://www.boom-studios.com/archives/boom-studios-celebrates-2023-eisner-nominations/
Tartaglione, Nancy (April 1, 2025). "Donnie Yen To Direct Lionsgate's 'John Wick' Spinoff About Blind Assassin Caine; Mattson Tomlin Writing – CinemaCon". Deadline. Retrieved April 30, 2025. https://deadline.com/2025/04/donnie-yen-to-direct-caine-movie-john-wick-spinoff-cinemacon-1236355917/
"BRZRKR: FALLEN EMPIRE #1 Announcement". BOOM! Studios. August 23, 2023. Retrieved December 1, 2023. https://www.boom-studios.com/archives/brzrkr-fallen-empire-1-announcement/