After shore-leave in Lisbon for the crew of HMS Diana, Master-at-Arms 'Toby' Toberman makes an official complaint to the ship's Captain about the behaviour of an officer he saw in a casino. Following the ship's 'Sod's Opera' party, Toby is reported missing from the deck - presumed lost overboard. Was it an accident or suicide - or was he given the proverbial push?
| Actor | Role |
|---|---|
 Larry LambCPO Chalkey White | CPO Chalkey White |
 Philip LockeCmdr. Lloyd | Cmdr. Lloyd |
 Maurice ColbourneLt. Cmdr. Kobahl | Lt. Cmdr. Kobahl |
 Nell CampbellZoe Summers | Zoe Summers |
 Clive MerrisonCommander Maybury | Commander Maybury |
 Cherie LunghiStephanie | Stephanie |
| VVictoria FairbrotherJean Toberman | Jean Toberman |
| PPaul KemberPeters | Peters |
 Jamie ForemanOperator 1 | Operator 1 |
| TTimothy BlockOperator 2 | Operator 2 |
| RRichard KaneWinterman | Winterman |
 William RussellSenior Officer | Senior Officer |