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.

Cast: Chris Jarman, Angel Coulby, Rasmus Hardiker, Thomas Brodie-Sangster, Kayvan Novak, Marc Silk, Adjoa Andoh, Rosamund Pike, David Graham, Aimee-Ffion Edwards, Craig Stein, Andres Williams