Watch full Thunderbirds Are Go 2015 Season 3 Episode 21
full HD online. Cartoon video Thunderbirds Are Go 2015 Episode 91
online for free in HD. Brains is having trouble building the T-Drive engine for the new Zero-X. The only person who can help build it is the Mechanic, as he build the original engine. But to avoid the Hood's mind control he is locked up inside a space prison known as the HEX. After convincing Colonel Casey, Alan and Kayo take Thunderbird 3 up to the HEX and rendezvous with Captain Rigby for the transfer. However, the Hood discovers this through his GDF spy and sends the Chaos Crew to get the Mechanic.