Masque is a fictional supervillain appearing in American comic books published by Marvel Comics. Masque was originally a prominent member of the sewer-dwelling community of mutant outcasts called the Morlocks, led by Callisto.

Callisto is a character appearing in American comic books published by Marvel Comics and is associated with the X-Men. She is the leader of New York City's subterranean mutant settlement the Morlocks, until losing that post in a duel against Storm. Storm subsequently leaves the group in Callisto's care as her representative, and the two eventually form an uneasy alliance.