Public Doman: Dragnet Season 2, Episode 1

Title: The Grenade
Original Air date: Sep 14, 1967
Synopsis: Friday and Gannon are working out of the juvenile division when they get called to a movie theater to investigate an attack on a high school student who had acid thrown on his back. The suspect is emotionally disturbed. Later, the suspect is holding teens at a party hostage and threatening to pull the pin.