Gamera is first mentioned in the fourth Dr. Slump chapter, titled "Dr. Monster". The kaijū specialist Dr. Monster gives Arale Norimaki a turtle and calls it Gamera to lure her to his hideout in order to kidnap her to get money. After returning to home, Arale sends Dr. Monster a lizard she calls Godzilla to thank him.
Later, the actual Gamera makes appearances in the Dr. Slump series, flying in the sky in "A Far and Distant Seashore". In "Penguin Village S.O.S.: Part 1", he tells Godzilla and Nekotora-7 about Dodongadon's arrival in Penguin Village. He is seen flying in outer space in "Zippity-Doo Doctor". In "The Great Arale-Eye Caper: Part 1", he appears along with King Ghidorah and Godzilla as they go to the Norimaki Residence to play with Gatchan. In "Kinoko on the Loose", he meets Kinoko Sarada and lights her cigarette with his Fire Breath. Gamera is seen among Arale's classmates in "The Big-City Student".
Gamera appears in a giant size at the beginning of the chapter "Penguin Village Dom-Dom-Dom!"
Master Roshi owns a flying turtle called Baby Gamera. The Gamera from Dr. Slump is seen playing with Nejishiki and some strange looking monster people while General Blue stops at the Phone Booth where he met Sourman. Gamera makes funny faces at General Blue with Nejishiki and the other monsters.