Mark Dennis was a big screen film actor known for powerful performances. Dennis's earliest roles were in film, including the thriller "Secret Beyond the Door" (1948) with Michael Redgrave, the Ted Donaldson drama "Rusty's Birthday" (1949) and the thriller "Targets" (1968) with Boris Karloff. He also appeared in the comedic drama "Nickelodeon" (1976) with Ryan O'Neal. In the seventies and the eighties, Dennis devoted his time to various credits, such as "Greased Lightning" (1977) and "Elvis" (ABC, 1978-79). In the eighties through the nineties, Dennis lent his talents to projects like "Knights of the City" with Leon Isaac Kennedy (1985), "The Offspring" with Martine Beswick (1987) and "Christmas in Toyland" (Family Channel Studios, 1996-97). Dennis most recently acted in "Wish I Was Here" (2014).