 The first series included Earth 2 Robin, Harbinger, Monitor, Psycho-Pirate, and Supergirl.Later series included Anti Monitor, Earth 2 Superman, Flash, Battle Armor Lex Luthor, Brainiac, Earth 1 Batman, Doctor Light, Earth Prime Superboy, Earth 2 Huntress, and Weaponer of Qward.Though it was not the first large-scale comic book crossover, "Crisis on Infinite Earths" is generally credited with popularizing the idea.