Step Into the 80's! (TV story)
From Tardis Wiki, the free Doctor Who reference
Prime Computer advertisement was a video released in 1979 to accompany the marketing campaign to sell Prime computers. It featured Tom Baker as the Fourth Doctor and Lalla Ward as Romana II, and was licensed by the BBC. There were 4 parts.
Cast
Home video releases
They were released commercially on DVD with Destiny of the Daleks.