This episode takes place in 2020.
Thunderbird references abound in the song "SOS Mr Tracy" with lyrics about International Rescue. Also, look out for the yellow vehicle parked at the side of the road. None of which should be possible if Terrahawks is set in 2020 and Thunderbirds in 2065. In the cavern the mention of all acts having to start somewhere refers to The Beatles performing in the Cavern Club in Liverpool.