In X-Men, Callisto was a mutant who possessed superhuman senses of sight, hearing, smell, taste, and touch. She was once a beautiful woman, but became scarred as a result of violent encounters with normal humans. She was the leader of the Morlocks, a group of mutants that lived in the sewers. She lost leadership of the Morlocks when Storm defeated her in a duel. She later became a servant of the wizard Kulan Gath. When she found herself in a new timeline, she became an ally of the X-Men and even rescued Professor X.
Callisto was a character in Xena: Warrior Princess and in Hercules: The Legendary Journeys. Callisto witnessed the death of her mother and sister at the hands of Xena, who killed them during a chaotic attack on her village. As a result of this trauma, Callisto became a ruthless and bloody warlord, who was out to get Xena. She died twice, became an immortal, then a God, then a demon, and ultimately an archdemon.
The Callisto series was a series of science fiction novels published in the 1970s by author Lin Carter.
In Doctor Who, the Callisto Pulse was a device that could disarm micro-explosives. River Song traded a Callisto Pulse for a vortex manipulator she needed to reach the Doctor.
In Star Trek, the U.S.S. Callisto was a Federation starship, and in a Star Wars novel, Callisto was the name of an Imperial Star Destroyer.
In Greek mythology, Callisto was a nymph of Artemis. She was transformed into a bear and set among the stars. Callisto has never ranked in the top 1,000 names in the United States. In 2012, 7 girls were named Callisto in the U.S.