To liven up a night of babysitting, teens Sarah Lane and Andi Garrett make prank phone calls, dialing up strangers and saying, "I saw what you did and I know who you are!" Unluckily for them, one of their victims is Steve Marak (John Ireland), who just finished killing his wife and is coming after them! Joan Crawford co-stars as Steve's love-starved neighbor, in this nail-biter from director William Castle. 82 min. Widescreen; Soundtrack: English Dolby Digital mono.