Spitfire (Lady Jacqueline Falsworth Crichton) is a fictional superheroine appearing in American comic books published by Marvel Comics. The character was created by Roy Thomas and Frank Robbins. Her character was first 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.