Oops! You need to enable JavaScript in your browser to start watching. CITV Thunderbirds Are Go Break Out Series 3 - Episode 21- In order to build a T-Drive engine for the Zero-X, Brains needs help from the Mechanic. Trouble is, the Mechanic is locked inside a space prison known as The Hex. Sun Sunday 19 Dec 6.21pm 24 mins Share this episode: Copied to clipboard Share on Facebook Share on Twitter Copy link to share