Polaris

Lorna Dane is a mutant born with the ability to manipulate metal, much like Magneto, who may or may not be her father. After spending years with the Uncanny X-Men, Lorna eventually became the leader of the offshoot team, X-Factor, which she now leads as the mutant heroine Polaris!

Children of the Atom
Polaris was eliminated in the opening round by Mojo.

Goin' Green
Lorna was eliminated by the Ridiculous X-Croc in the first round.