Orac was a great character, despite being a plastic box with some Christmas lights in it. In one episode, the characters are trapped by pirates until they hand over Orac. Which Avon (Paul Darrow) the anti-hero does to the concern of his team mates. Then at the denouement, since Avon is also a good deal smarter than his heroic companions, he produces Orac. When asked what he gave to the pirates, he says 'Oh, just a box with some lights in it'. For the 70s, this was up there with Joss Whedan's best.