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