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