Affiliations: Giganta and the Legion of Doom (Luthor)
For prior character development, refer to Bizarro’s bio in the Superman: TAS's character guide.
Bizarro is the defective clone of Superman who first appeared siding with Giganta (with no explanation of how he got out from his adopted planet). He claimed to be in love with her, so he would even break Grodd out of jail for her. Wonder Woman vainly tried to reason with him, but then was forced to knock him out.
Bizarro then resurfaced as a member of Grodd’s Legion of Doom. Lex Luthor performed a brain surgery on him, and as a result, from that point on Bizarro was completely faithful and devoted to Luthor. Bizarro accompanied Luthor, Devil Ray, Rampage and Tala to the Temple of Nanga Parbat and was responsible for the slaughter of dozens of monks.
Later, as soon as Grodd starts attacking Luthor, Bizarro immediately jumps at him to save Luthor. However, he was disposed of by Rampage and Electrocutioner.
Bizarro also took part in the battle against Darkseid, and fought alongside Green Arrow and Black Canary.