Jack was captured as a toddler. With extremely powerful biotic abilities, she became the core of a research project run by Cerberus. Jack is a violent and dangerous person, but joins Shepard in exchange for files detailing her time as a child with Cerberus. Jia Jem has Jack's difficult look down. Shaved head, large bar code across her skull and torso covered in tattoos, she is the living version of the borderline psychopath.