On Mars a landslide traps Captain Taylor and a scientist in a cavern. Alan and Virgil fly to the red planet and assist with the aid of Thunderbird 3 and a specialised Exo-Pod. However, circumstances in the cave lead Virgil to eject the air in his suit, leaving our heroes short on air inside a leaking cave.
Elenco: David Graham , Rasmus Hardiker , Kayvan Novak , Rosamund Pike , Thomas Brodie-Sangster , David Menkin , Angel Coulby , Chris Jarman , Adjoa Andoh , Jenna Coleman , Sandra Dickinson , Teresa Gallagher .