Weasel (Jack Hammer) is a fictional character who appears in the comic books published by Marvel Comics. Created by Fabian Nicieza and Joe Madureira, he first appeared in Deadpool: The Circle Chase (limited series) #1 (August 1993). Weasel is a friend, sidekick, information broker and arms dealer for Deadpool. Although Weasel is perhaps Deadpool's best friend, Deadpool, because of his frequent mood swings and tenuous mental state, still often abuses or mistreats him, although Weasel has also displayed an opportunistic streak against his friend on occasion.