The four series of 13x50mins ran from 02/01/78 to 31/12/81, beginning the same night that Star Wars premiered in London. A huge hit, it scored 10 million viewers directly against Coronation Street for it’s final climactic episode. Because the budget was limited, it built it’s appeal around the characters. This clip from a worthy BBC Schools programme looks at the motivations of the two leads: Roj Blake and Kerr Avon. Although Avon spent much of his time criticising and arguing with Blake, the final irony was that the series ended with Avon doing his utmost to return Blake to the crew of the Scorpio, long after the Liberator had been destroyed.