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Beast

Kelsey Grammer as Beast in 20th Century Fox's X-Men: The Last Stand - 2006
20th Century Fox

Real Name: Dr. Henry "Hank" McCoy
History: He received the nickname "Beast" as a football player in college. He became one of Professor Xavier's earliest students because of his strength and smarts in the laboratory studying genetics. He is believed to be the only mutant to work for the United States government.
Powers: Superhuman strength and agility.

Courtesy of www.x-menthelaststand.com