<Tr> <Th> Occupation </Th> <Td> Actor, musician, voice actor </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 2001--present </Td> </Tr> <P> Samuel Stewart Witwer (born October 20, 1977) is an American actor and musician . He has portrayed Crashdown in Battlestar Galactica, Davis Bloome in Smallville, and vampire Aidan Waite of the US / Canadian remake of BBC's supernatural drama series Being Human on Syfy in the US and Space in Canada . He also voiced protagonist Galen Marek / Starkiller in the multimedia project Star Wars: The Force Unleashed, as well as The Son and Darth Maul in Cartoon Network's Star Wars: The Clone Wars and Emperor Palpatine as well as Maul in Disney XD's Star Wars Rebels . Witwer was also the 2017 reigning Movie Trivia Schmoedown Star Wars Champion, a title he won from Ken Napzok in a 30 - minute Iron Man Star Wars trivia match; he was stripped of the title in June 2018 however as he was unable to defend it due to his upcoming work on the CW series Supergirl . He also had a role as Mr Hyde in Once Upon a Time . </P> <P> Witwer grew up in Glenview, Illinois, a small suburb outside of Chicago . He attended Glenbrook South High School, during which time he was involved in drama and theater classes, as well as being the lead singer of a high school band called "Love Plumber". He attended the Juilliard School for a time before moving to Los Angeles . </P>

Who plays hyde on once upon a time