Main Characters Lt. Peek 2 main appearances Lt. Cmdr. Beaumont 1 main appearances Cmdr. Mark Nialls 1 main appearances Lt. Wakelin 1 main appearances Cmdr. Alan Glenn 1 main appearances Capt. Edward Holt 1 main appearances Lt. Cmdr. Napier 1 main appearances Reg. Fuller 1 main appearances Lt. Cmdr. Kiley MAA Heron Lt. Last
Recurring Guest Characters Sub-Lt. Carwith 1 guest appearances Wing Cmdr. Blazey 1 guest appearances The Ape 1 guest appearances