Thunderbirds Are Go Episode 25 Undercover Episode Title:Undercover.Episode Description:An undercover operation involving Lady Penelope and Parker to recover a stolen Repulser Magnetic Array for the Global Defence Force gets blown prematurely. Parker is taken prisoner by the thief aboard a stolen GDF flyer, with Kayo in pursuit in Thunderbird Shadow. The flyer crash lands on a factory roof and International Rescue must intervene to help save Parker and a factory worker. Kayo confronts the thief to find he knows her secret relationship with the Hood, and must weigh letting him escape against her secret coming out in the open.