Starring: David Graham, Ray Barrett, Peter Dyneley, Shane Rimmer
Continuity mistake: When the Gray and Houseman Construction Company vehicle is moving along at the beginning of the episode, the launching pad is raised, but after a quick cut to the crew, we return to the vehicle and the pad is now lowered.
Continuity mistake: In several wide shots of Thunderbird 1 and Eddie's tractor on the cliff, the yellow pins that were fired from TB1 earlier and the rock they were holding have disappeared.
Audio problem: As John and Gordon are fitting the new component on Thunderbird 5, John says, "It looks like we'll be another two hours before we're back in business. In the meantime, International Rescue is non-operational." But he is voiced by David Graham, not Ray Barrett.
Trivia: The shot of Thunderbird 2 flying in the dark is actually reused footage from a previous episode, "The Man from MI5."