Passenger 3 (The Man from MI.5)

A passenger with grey hair was aboard the Fireflash flight in 1965 which took Lady Penelope Creighton-Ward from England to Nice so that she could meet with MI5 agent Jimmy Bondson. Towards the end of the journey, he was sat in the cocktail lounge. (TV: The Man from MI.5)

Other sources dated the activities of International Rescue to the 1990s, (PROSE: The Dying Days) the 2060s, (PROSE: Titan Declares War! et al.) and the 2080s. (PROSE: Captain Scarlet in Death Crash! et al.)

Behind the scenes
The puppet which "played" the passenger was also seen in several other episodes of Thunderbirds. It had a speaking role as Lambert in Vault of Death where he was voiced by David Graham. The puppet appeared in a silent capacity as a spectator at the fake rescue in The Impostors, at the Parola Sands Raceway in Move – And You're Dead, at the launching of Ocean Pioneer II in Danger at Ocean Deep, and as a gambler and as a passenger at London Airport in The Duchess Assignment.