Trog (1970)
Anthropologist Dr. Brockton unearths a primitive troglodyte -- an Ice Age "missing link": half-caveman, half-ape -- in a local cave. Through medical experimentation, she manages to communicate with him and domesticate him before he's let loose by an irate land developer and goes on a rampage, terrorizing the local citizenry.
Directed by: Freddie Francis
Starring: Joan Crawford, Michael Gough, Bernard Kay, Kim Braden, David Griffin, John Hamill
Links: IMDb, Movie posters, Movie stills