Sam Witwer is a film and television actor best known for his roles on "Smallville" and "Battlestar Galactica. " Witwer developed an interest in acting while performing in his high school drama program, and after graduating from Glenbrook South High School he briefly enrolled at the Juillard School of Drama in New York City. He relocated to Los Angeles to pursue his acting ambitions and landed his debut TV role in a 2001 episode of the medical drama "ER." He soon found steady supporting work on shows like "JAG" and "Angel," and in 2004 he was cast as Lt. Crashdown on the sci-fi series "Battlestar Galactica." He portrayed the good-intentioned but fragile officer until 2005, and next earned critical acclaim for his recurring role on the serial killer drama "Dexter." Witwer landed guest appearances on such shows as "It's Always Sunny in Philadelphia" and "Shark" before voicing the character of Emperor Palpatine in the 2008 videogame "Star Wars Unleashed." That same year he was cast as Davis Bloome on "Smallville," and appeared in over 20 episodes. Witwer, who also worked as a stuntman on the 2006 action-adventure film "Crank," has since appeared in the 2009 film "Gamer" and the 2010 series "Being Human."