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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
After appearing in the pilot episode, the Mutant Gang make their proper debut in Episode 3, "Under Pressure," with Keil Oakley Zepernick playing the gang's leader, Vernon Wagner.
Source: https://www.cbr.com/gotham-knights-dark-knight-returns-mutant-leader/