Richard Hammond's Crazy Contraptions

Engineering enthusiasts from around the UK competing to create the best chain-reaction machines from everyday objects. In this episode, three brothers from Somerset and a team from Loughborough University are challenged to build ingenious devices that will allow Richard to straighten his duvet and "make the bed" without leaving the bath tub. Machine guru Zach Umperovitch is the expert judge and Shini Somara fills in the science behind the teams' eccentric contraptions.

Three stars of TikTok take on three civil engineering students from the University of Southampton, as they attempt to create ingenious chain reaction machines that allow Richard Hammond to boil his kettle while sitting on the lavatory. Chain reaction machine guru Zach Umperovitch is the expert judge and Shini Somara fills in the science behind the teams' eccentric contraptions

Three amateur pilots compete against a trio of stunt fans to build an ingenious machine that will allow Richard to feed his dog without even leaving his desk

A trio of physics-obsessed students from Leeds take on three Spanish-born brothers in a bid to build a machine to allow Richard to water the plants without getting up from watching the TV

In the first semi-final, two teams of brothers build jaw-dropping chain reaction machines to enable Richard to dust his ornaments without getting out of bed.

It's all to play for as the teams are tasked with creating a chain reaction machine that allows Richard to cook sausages in the kitchen without leaving his study.

It's the grand final. Who can build the best party machine for Richard's house and garden?