Troy promises an orphaned son of a recently deceased WASP aquanaut a Christmas to remember at Marineville, whilst the Stingray crew tries to solve the mystery surrounding a mysteriously abandoned enemy craft.
| Actor | Role |
|---|---|
 Don MasonCaptain Troy Tempest (voice) | Captain Troy Tempest (voice) |
 Robert EastonLieutenant George Lee 'Phones' Sheridan (voice) | Lieutenant George Lee 'Phones' Sheridan (voice) |
 Ray BarrettCommander Sam Shore / Sub-Lieutenant John Horatio Fisher (voice) | Commander Sam Shore / Sub-Lieutenant John Horatio Fisher (voice) |
 Lois MaxwellLieutenant Atlanta Shore (voice) | Lieutenant Atlanta Shore (voice) |
 David GrahamAlien / Shore's Drinking Buddy (voice) | Alien / Shore's Drinking Buddy (voice) |
 Sylvia AndersonBarry Byrne (voice) (uncredited) | Barry Byrne (voice) (uncredited) |