Pit of Peril - S1-E2
Audio problem: When Brains says, "Fine, Scott, ready to detonate explosives on your instructions," his mouth is not moving.
Thunderbirds (1964)
1 audio problem in Pit of Peril - chronological order
Starring: David Graham, Ray Barrett, Peter Dyneley, Shane Rimmer
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: Although he is the main villain, the Hood appears in only six episodes throughout the entire series.