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