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