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