Passage: Martin Seamus "Marty" McFly is a fictional character and the main protagonist of the Back to the Future trilogy. He is portrayed by actor Michael J. Fox. Marty also appears in the animated series, where he was voiced by David Kaufman. In the videogame by Telltale Games, he is voiced by A.J. Locascio; in addition, Fox voiced Marty's future counterparts at the end of the game. In 2008, Marty McFly was selected by Empire magazine as the 12th Greatest Movie Character of All Time.\n\nQuestion: Based on this passage, who plays marty in back to the future? Let's think fast. Stream of consciousness:
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To answer the above question, the relevant sentence is: He is portrayed by actor Michael J. Fox. So the final answer is Michael J. Fox.
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