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Koko the Space-Monkey is an animal belonging to Brainiac as his pet. He apparently has the intelligence to understand his master's speech, although little is known about his origins. There is also a version of Koko owned by the Legion of Super-Heroes' Brainiac 5 in the 30th Century. Koko was created by Otto Binder and Al Plastino, first appearing in Action Comics #242. (1958)