Callisto is a villainess in the 2006 X-Men movie, X-Men:The Last Stand. She is played by Dania Ramirez.
Callisto and the Omega Team decided to join Magneto and his brotherhood, because they shared the same beliefs. She showed her powers and then became a leader. Her powers were enchanced senses and super speed. While saving Mystique, Magneto and his brotherhood asked her to use her powers in locateing mutants, which is how they found Mystique and new members, Juggernaut and Multiple Man. She was a great fighter as well, fighting Storm at Jean Gray's house.
Later at the battle on Alcatraz, she is defeated and killed by Storm, who throws her against a fence and electrocutes her.