Jet Lagg

Jet Lagg was one of the superheroes, along with Spider-Man, Superman and Batman, who invaded the Doctor's TARDIS after the Fifth Doctor parked it on Madison Avenue in New York. Upon finding them, the Doctor stated he had learnt never to come to New York during a crimewave. (NOTVALID: Doctor Who? 64)

Behind the scenes
Unlike many of the other iconic and well-known superheroes that featured in the story, Jet Lagg was the parodic creation of Tim Quinn and Dicky Howett, who also wrote and illustrated it respectively.