Katherine Pryde

Kitty Pryde is a mutant with the ability to "phase" through walls and floors.

X-Men
Katherine "Kitty" Pryde is a mutant with phasing abilities and is able to rise and lower herself through solid objects. She is a student at Xavier's School for Gifted Youngsters. She is from Illinois. Senator Kelly referenced as "the girl who can walk through walls" in congress.

X2: X-Men United
When William Stryker's military forces attacked the X-Mansion, Kitty phased through walls and people to escape. Xavier used Kitty to retrieve files from Stryker's office which he presented to the President of the United States.

X-Men: The Last Stand
She became a rival of Rogue for the romantic attentions of Iceman. She joined the X-Men in the battle on Alcatraz Island, breaking of from the battle to save Leech from the Juggernaut.

Relationships

 * Iceman - former Love interest.
 * Rogue - Teammate and Love Rival.

Appearances/Actors

 * Canon (3 films)
 * X-Men (First appearance) - Sumela Kay
 * X2: X-Men United - Katie Stuart
 * X-Men: The Last Stand - Ellen Page

Behind the scenes
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Trivia

 * Kitty's name was seen on a screen among a list of other mutants when Mystique hacks the system of William Stryker for information on different mutants.
 * Senator Kelly referenced as "the girl who can walk through walls" in congress.
 * Her alias, Shadowcat, from the comics is never used in the film series.
 * Her first appearance in the comics was during the Dark Phoenix saga, which ironically would be adapted for part of the plot of X-Men: The Last Stand.