Jamie Madrox, also called the Multiple Man, is a fictional character, a Marvel Comics superhero, associated with the X-Men. Created by writer Len Wein with script from Chris Claremont and art by John Buscema, he first appeared in Giant-Size Fantastic Four #4 (February 1975).
Madrox has the ability to create duplicates or "dupes" of himself. The duplicates have some level of autonomy from Madrox, creating a complex psychological condition, although Madrox is outwardly joking and friendly.
Originally a lab assistant of genetic researcher Moira MacTaggert, Madrox joined the 1990s-era Pentagon-sponsored mutant team X-Factor where writer Peter David did much to flesh out his character. Currently, Madrox is the leader of the detective agency X-Factor Investigations in a new David-written X-Factor series. Multiple Man appears in the 2006 film, X-Men: The Last Stand, in which he was portrayed by Eric Dane.