 Chris Barrie plays Ace Rimmer, Craig Charles is Spanners, Danny John-Jules is the Chaplain, Robert Llewellyn is Bongo, and Hattie Hayridge got the chance to play more than just a computer head as Mellie.Kalli Greenwood appeared as Mrs. Rimmer and Simon Gaffney appeared as Young Rimmer—reprising their roles from Polymorph (and Simon also appeared as young Rimmer in "Timeslides"), while Hetty Baynes voiced the Cockpit Computer.The spaceship scene introducing Ace Rimmer parodies the 1986 Tom Cruise movie "Top Gun" and even features similar heroic music.