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