'Revenge of the Nerds' Star Robert Carradine -- Badly Hurt in Gruesome Car Crash

TMZ has learned that Robert Carradine -- the star of "Revenge of the Nerds" -- was involved in a horrifying car accident with a semi-truck. The head-on collision occurred last week on a Colorado highway at 3 PM. According to the police report, Carradine crossed the dividing line and slammed into the truck. Firefighters removed Carradine from his car and he was rushed to a nearby hospital with "incapacitating" injuries. Carradine's wife was in the car and also injured.