Do you want to compare Onslaught with Mister Sinister? Discover the powers, weakness & weapons of Onslaught and Mister Sinister from Onslaught Biography and Mister Sinister Biography. Find out all about Onslaught and Mister Sinister.# Check out how is Onslaught unique and distinct from Mister Sinister. Discover their love interest, sidekicks, family tree and the movies and games list in which Onslaught and Mister Sinister have appeared. Find out everything about them here!