Slumber Party Massacre III

The name of this movie is Slumber Party Massacre III released in 1990-09-07 and it's main theme is After a hard day of volleyball at the beach, a teen whose parents are away decides to have a slumber party with her girlfriends. Their boyfriends predictably show up to scare them, but a stranger from the beach is also seen lurking around the house. Soon the group begins experiencing an attrition problem..