Spitfire (Lady Jacqueline Falsworth Crichton) is a fictional character, a superheroine in the Marvel Comics universe created by Roy Thomas and Frank Robbins. Her character was fist introduced in the Invaders comic book series as an intended replacement for the Union Jack character, but the costume design did not fit the female torso so the character of Spitfire, named after the Supermarine Spitfire fighter plane, was created.