Escape from Women's Prison (1978)

"Chained, Beaten and Abused ... Now They're Bustin' Out!"

Four female convicts break out of prison, and during their escape they take hostage a bus full of young female tennis players. They drive the bus to the house of the judge who originally sent them to prison, where--since this is after all a women-in-prison picture--the hostages undergo various forms of physical and sexual abuse in various degrees of nudity.