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Operations are unjustly suspended when imposters disguised as International Rescue take secret papers from a vault.
International Rescue is framed by a gang out to steal top secret papers. Jeff Tracy decides to lay low and allow hidden agents to seek out the imposters. A space observatory involved in the manhunt for International Rescue develops a technical fault and when an astronaut attempts to repair it he is sent hurtling away as a result of a thruster fault. Can Lady Penelope and some hillbilly agents expose the imposters in time so the Thunderbirds can be launched to save the astronaut?