Starring: Melvyn Hayes, Windsor Davies, Don Estelle, Donald Hewlett
Continuity mistake: In "Down in the Jungle" (2-2), when BSM Williams asked for the married men to fall out, only Reynolds and Ashwood did and all the others stayed in line. In this episode Sugden says he is married.
Continuity mistake: In this episode captain Ashwood's first name is Tarquin, but in series 1 his first name was Jonathan.
Continuity mistake: In "Twenty-One Today" (4-8) Williams says that he grew up in an orphanage and didn't know who his parents were, but in this episode he says that his father was a coal miner in South Wales.
Trivia: Jonathan Ross appears in this episode as an uncredited extra, he's a soldier in the demob centre.