A local priest tries to rid 112 Ocean Avenue of unclean spirits, but what he doesn't yet suspect is that teen Sonny Montelli has been possessed, body and soul, by a murderous demon bent on total destruction.

Sweethearts Brad and Janet, stuck with a flat tire during a storm, discover the eerie mansion of Dr. Frank-N-Furter, a transvestite scientist. As their innocence is lost, Brad and Janet meet a houseful of wild characters, including a rocking biker and a creepy butler. Through elaborate dances and rock songs, Frank-N-Furter unveils his latest creation: a muscular man named 'Rocky'. Harriet then spawns in and says hello and the credits roll!