Alan Oppenheimer is an American character actor and voice actor. He has performed numerous roles on live-action television since the 1960s, and has had an active career doing voice work in cartoons since the 1970s. His most notable voice roles include Skeletor from He-Man and the Masters of the Universe, Vanity Smurf in the 1980s Smurfs cartoon, and Seaspray, Beachcomber, and Warpath in the Generation 1 Transformers cartoon.

He provided the voices of Darren and the Sun in the Adventure Time episode "Something Big."

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