Big Green is an evil doppelganger of Slimer. He first appeared in The Real Ghostbusters in the episode The Two Faces of Slimer. There was a leak in the Containment Unit that caused Slimer to turn into Big Green every time he went to sleep. He was captured when Slimer and Big Green were separated by slightly modified proton streams. Flashbacks of his first appearance are seen in the hour-long version of the later episode Deja Boo.
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