McManus entered the comic book field in the early 1980s with work for Heavy Metal and DC Comics. He gained wider attention when he illustrated two 1980s issues of Swamp Thing written by Alan Moore. He received a nomination, with Alan Moore, for a 1985 Jack Kirby award for "Pog" in Swamp Thing 32. The story, an inventive science fictional reinterpretation of Walt Kelly's Pogo, was written by Moore specifically for McManus, who rose to the challenge with an appropriate Kellyesque art style.
McManus and Todd Klein collaborated on Omega Men, creating Zirral and other characters for that series. He has also drawn issues Batman, Doctor Fate and a pair of limited series about the witch Thessaly written by Bill Willingham.
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