Jessie was kidnapped by the Fortress for study, so Professor X sent Wolverine to retrieve her. Wolverine convinced Typhoid Mary to rescue Jessie. She eventually succeeded, but the man-hating Bloody Mary persona emerged and knocked Jessie unconscious.
When Jessie woke up, she went after Mary. Upon finding her, she revealed that she was transgender, feeling like a girl trapped in a boy's body. Mary accepted this, reverting to her more docile persona, and the two went in for psychiatry together.
Powers and Abilities
Empathic Metamorph: which is also called an "Unconscious Chameleon", able to take on the physical characteristics of those around her.
Jessie came out as a transgender girl in Marvel Comics Presents #151 and is the first openly transgender character in the Marvel Universe.