DeepStar Six (released in the Philippines as Alien from the Deep) is a 1989 American science-fiction horror film directed and co-produced by Sean S. Cunningham. Its plot follows the crew of the titular underwater military outpost, who struggle to defend their base against the attacks of a sea monster (possibly a giant eurypterid). The film stars Greg Evigan, Taurean Blacque, Nancy Everhard, Cindy Pickett, Miguel Ferrer, Nia Peeples, Marius Weyers, Elya Baskin, Thom Bray, Ronn Carroll and Matt McCoy.
DeepStar Six was theatrically released in the United States on January 13, 1989, and received generally negative reviews from critics.