Episode 4 - S3.E4

Six more teams compete in the fourth heat, as robots Iron-Awe 6, the Kegs, Tauron, Nuts 2, Concussion and Androne 4000 battle through a series of group battles and knock-out rounds. Among the contestants controlling the machines is a veteran of the series, returning to defend his legacy. Presented by Dara O Briain and Angela Scanlon.