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