In this first episode of Richard Hammond's Brain Reaction, Victoria Coren Mitchell and teammate London Hughes go head to head with Johnny Vegas and Henning Wehn. And shining the light of science on proceedings is comedian and brain box Ria Lina.

This episode sees Victoria Coren Mitchell and teammate Maisie Adam go head to head with Johnny Vegas and Krishnan Guru-Murthy. As always, the teams are joined by science brainbox and comedian Ria Lina.

Victoria Coren Mitchell and teammate Desiree Burch go head-to-head with Johnny Vegas and Kiell Smith-Bynoe. As always, the teams are ably assisted by comedian and science geek Ria Lina.

Victoria Coren Mitchell and teammate Guz Khan go head-to-head with Johnny Vegas and Kiri Pritchard-McLean. And, as always, bringing the science smarts is comedian and brain box Ria Lina.

David Baddiel, standing in for Johnny Vegas, goes head to head with Victoria Coren Mitchell. Guests Bobby Mair and Lou Sanders join the fun, while comedian and brainiac Ria Lina tries to keep things on track.

In this riotous series finale episode, Victoria Coren Mitchell and teammate Robin Morgan pit their grey matter against Johnny Vegas and Thanyia Moore. And keeping proceedings scientifically relevant is comedian and clever woman Ria Lina.