Scott, Virgil and Brains take Thunderbird 3 to intercept the crew of the Calypso which is on a crash course with Earth. Meanwhile Gordon borrows Thunderbird 1 to help Parker look for missing Sherbert.

Cast: Rosamund Pike, David Graham, Rasmus Hardiker, David Menkin, Kayvan Novak, Thomas Brodie-Sangster, Nina Sosanya, Laurel Lefkow