The history of Doctor Who on video stretches right back to the dawn of the home video industry. Back in 1983, the BBC released Revenge of the Cybermen on VHS video (and also on the defunct Betamax and Video 2000 formats). In the 20 years since then, nearly 150 Who-related VHS videos have appeared, which includes all complete classic series stories, compilations of the other surviving episodes, some documentaries and a number of incomplete stories (with photos and narration to fill the gaps). Also, released was non-BBC VHS videos : documentaries, interviews and spin-off dramas.