Real name: Unrevealed
Other aliases: None known
Identity: Secret
Occupation: (current) Adventurer (former) Model, former leader of the Morlocks, bodyguard for Moira MacTaggert
Legal status: Presumably a citizen of the United States with no known criminal record
Place of birth: Unrevealed
Marital status: Unrevealed
Known relatives: None
Group affiliation: Gene Nation, (former) Morlocks
Base of operations: (current) The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattan's surface), X-Factor I's sentient starship "Ship," Apocalypse's secret bases
First appearance: X-MEN (first series) #169

History: One-time leader of the Morlocks, it was Callisto who discovered the "alley", the main tunnel that is connected to a network of tunnels beneath New York City (see Morlocks). The tunnels were constructed in the 1950's by the US government in case of a nuclear war but were later abandoned. Callisto made this her home and found another mutant named Caliban who had the psionic ability to locate other mutants. Callisto gathered together a large community of mutants. The community was organized like a large street gang and led by Callisto.

Later Callisto abducted Angel to be her consort but was defeated in single combat by Storm of the X-Men, who became the official leader of the Morlocks. Callisto continued to act as their leader in Storm's absence. Callisto later attempted to take revenge on the X-Men by trying to force Kitty Pryde to wed Caliban. She again battled Storm and lost.

Callisto then became a warrior servant of sorcerer Kulan Gath, who transformed New York City into a city from the hyborian age. Her life was saved by Storm and together they turned against Kulan Gath and defeated him. Callisto and her allies found themselves on a new timeline where Kulan Gath never transformed New York.

Callisto was wounded during the Marauder's massacre of the Morlocks and took refuge with the X-Men. She later encountered Peter Nicholas, the former X-Men called Colossus. Callisto herself was transformed into a beautiful model by Masque, who later captured her and told Peter how she had transformed Callisto. Peter defeated Masque but Callisto was then attacked by Genoshan Magistrates. She escaped and embarked on a new life with Peter Nicholas as lovers, but this new lifestyle did not last long and so Callisto and Colossus went back to their former lives.

Later, with the few remaining members of the Morlocks, Callisto joined with Colossus's thought to be long dead brother Mikhail. The Morlocks were thought to have been killed when one of the tunnels they were hiding in was flooded, but unknown to the X-Men who were trying to save them, Mikhail opened a portal to another dimension and saved Callisto and a handful of Morlocks. Together, Mikhail and Callisto, now romantically involved, created Gene Nation, a militant terrorist group which sought to punish "upworlders" back on Earth. Their stay in this dimension did not last long, due largely to the intervention of the X-Man Storm, and Callisto and the rest of Gene Nation returned to Earth.

Most recently, Callisto, joined by the young ex-Gene Nation member named Marrow, tried to abduct government agent Henry Gyrich, who they held responsible for OPERATION: Zero Tolerance. As the two mutants attacked Gyrich's limousine the super hero known as Spider-Man stepped in to stop them. Although the death of Gyrich was prevented by Spider-Man, the mutant involvement caused the activation of two Prime Sentinels who where once Gyrich's agents. The Prime Sentinels battled with the mutants and Spider-Man, and as they were about to kill both Spider-Man and Marrow, Callisto, having witnessed too many deaths in her life time, leaped in the way of the sentinel's bio-blast and took the blast at full force.

Callisto was seriously injured by the Prime Sentinels, but it gave Spider-Man and Marrow a chance to fight back and with the help of Agent Gyrich they destroyed the Prime Sentinels. Callisto was taken into the Morlock tunnels by Marrow to have her wounds heal. It is not known if Callisto has lived through the experience.

Height: 5 ft. 9 in.
Weight: 130 lbs.
Eyes: Blue
Hair: Black
Other distinguishing features: Callisto formerly wore a patch over her right eye, which was then blind, and bore scars on her face

Known superhuman powers: Superhumanly keen senses of sight (including night vision), hearing, smell, taste, and touch.