I have collected all four seasons of The Streets of San Francisco. It was the best cop show of the 70's. The stars Karl Malden, a veteran actor and Michael Douglas an up and coming star make a fantastic duo as Stone and Keller, SFPD homocide investigators.
As a retired cop from the 80's who grew up watching this show every week , I really enjoy watching it years later without commercial interruption. The many guest actors were always great from Bill Bixby to Mark Hamill to Paul Sorvino. The film quality is great too. Much better than it was when I was watching it via a rooftop antenna! If you are a fan of 70's cop shows this one is a must have.