Sally (Marilyn Burns) hears that her grandfather's grave may have been vandalized, she and her paraplegic brother, Franklin (Paul A. Partain), set out with their friends to investigate. After a detour to their family's old farmhouse, they discover a group of crazed, murderous outcasts living next door. As the group is attacked one by one by the chainsaw-wielding Leatherface (Gunnar Hansen), who wears a mask of human skin, the survivors must do everything they can to escape.