Kathryn 'Kitty' Pryde,
one-time youngest member of the legendary mutant team known as the X-Men. Her power was known as Corporal Intangability, which would let her 'phase' her molecules through any solid object, effectively passing through it like a ghost. Formerly known by the code names 'Sprite' and '
Ariel,' she later went on to be a founding member of Britain's premiere superhero team, Excalibur.