Thunderbirds Are Go Season 3 Episode 21 - Break Out Episode Title:Break Out.Episode Description:Brains is having trouble building the T-Drive engine for the new Zero-X. The only person who can help is the man who built the original engine - The Mechanic! But to avoid the Hood's mind control he's locked up inside a space prison called the HEX. After convincing Colonel Casey, Alan and Kayo take Thunderbird 3 up to the HEX and rendezvous with Captain Rigby who would oversee the transfer. However, through his GDF spy, the Hood discovers this and sends the Chaos Crew to pick up his old friend. Havoc and Fuse destroy the HEX but the Mechanic, who refuses to go with them, escapes and agrees to build another T-Drive for International Rescue, if Brains keeps his promise to free him from the Hood.