'A Christmas To Remember' by Dennis Spooner

When Troy meets the orphaned son of an ex-WASP aquanaut, he decides to give the boy a Christmas to remember. He arranges for the young lad to join the Stingray crew in a re-enactment of a battle with a mysterious enemy craft, which was left abandoned after the original conflict. However, Troy is unaware that a member of the crew is still aboard the vessel - and when Phones boards the ship to take command, he is captured and forced to lure Troy into a trap…

Don Mason (Captain Troy Tempest), Robert Easton (Lieutenant George Lee ‘Phones’ Sheridan / Agent X20), Lois Maxwell (Lieutenant Atlanta Shore), Ray Barrett (Commander Sam Shore / Lieutenant Fisher / Titan)

Directed by Alan Pattillo
Produced by Gerry Anderson

TX (UK): 20th December 1964

Notes:
*Featuring Captain Troy Tempest, Lieutenant George Lee 'Phones' Sheridan, Commander Sam Shore, Lieutenant Atlanta Shore, Lieutenant Fisher and Marina