Synopsis by Hal Erickson
Ian Hendry, who as Dr. David Keel had been one of the original stars of the original Avengers, is here cast as Gunner, an amnesiac secret agent. Having been missing for seventeen years, Gunner suddenly shows up, and just as suddenly recovers his memory, providing a strange coded message. This new information may or may not be able to lead Steed (Patrick MacNee), Purdey (Joanna Lumley) and Gambit (Gareth Hunt) to the whereabouts of a notorious double agent known only as the White Rat. As usual, however, the villain gets the upper hand along the way, forcing the New Avengers to gamble with their lives.