Dopefish are large, green scaled, buck-toothed ichthyoids that are believed to be the second-dumbest creature in the universe, runner up to the Ravenous Bugblatter Beast of Traal. They have very low brain function, with thought patterns that reportedly only go: "swim, swim, hungry, swim, swim, hungry". They are tremendously opportunistic, and will eat anything that moves, but apparently favor a diet of heroes, such as Commander Keen.
- Commander Keen 4: Secret of the Oracle (1991)
- Commander Keen (2001)
- The Dopefish is likely the most often-cited alien species in media, always as an Easter Egg.
- Tom Hall was the creator of the Dopefish, which he created as one of 24 potential "characters" for Commander Keen 4. According to him: "I just drew this stupid little fish".