The episode to feature the largest cast of characters (in speaking roles) seen in any single "Thunderbirds" episode or either of the feature films with 20 voices provided by all of the cast members from the second season (Jeremy Wilkin
had replaced David Holliday
as the voice of Virgil at this time), featuring Paul Maxwell
as Capt. Ashton, although he was not credited in the end titles. See more
[Brains is driving into the London Airport under the pseudonym of Mr. Hackenbacker
This is Hiram K. Hackenbacker calling Jeff Tracy. Come in, Jeff Tracy.
Go ahead, er... Mr... Hackenbacker.
I am now entering the London Airport.
Good luck Br- I mean Mr. Hackenbacker.