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