Ultimate Brain - Episode Guide

Sam Nixon and Mark Rhodes from Sam & Mark's Big Friday Wind-Up and Naomi Wilkinson from Naomi's Nightmares of Nature

Kia Pegg, Amy-Leigh Hickman and Joe Maw from The Dumping Ground

Khalil Madovi, Akai Osei and Ruby Morgan from 4 O'Clock Club

Shannon Flynn, Richard Wisker and George Sear from Friday Download

Toby Murray from Dani's Castle

Bobby Lockwood, Louisa Connolly-Burnham and Kedar Williams-Stirling from Wolfblood

Nick James, Jayden Jean-Paul Denis and Chloe Wong from Hank Zipzer

Sam Fletcher, Kelly-Anne Lyons and Marvyn Dickinson from DNN

Ted Robbins, Ian Kirkby and Scarlet Hazeldine from The Slammer

Dr. Brain looks back at some of the craziest scientific challenges from the series.

Iain Stirling, Chris Johnson and Ed Petrie from All Over the Place

Barney Harwood, Radzi Chinyanganya and Lindsey Russell From Blue Peter

April Hughes, Jordan Loughran and Kerry Boyne from Dixi

Cleo Demetriou, Sophia Dall'Aglio and Ameerah Falzon-Ojo from So Awkward

Stevi Ritchie, Betsy-Blue English and Parisa Tarjomani from The X Factor

Molly Rainford, Leondre Devries and Charlie Lenehan from Friday Download

Leah Boleto, Hayley Hassall and Ricky Boleto from Newsround

Stacey Dooley, Robert Keene and Jasmine McAteer from Show Me What You're Made Of

Ben Shires, Haruka Kuroda and Stephen "Sizzling Steve" Kish from Officially Amazing

Eubha Akilade, Ben Cartwright and Oliver Woollford from Eve

Stars of Match of the Day Kickabout, Tyler West, Rachel Stringer and John Farnworth, take on two young teams in a mash-up of science, entertainment and insanity. In this show, Guinea Pig tries to make a big splash with some genius inventions.

Matilda Ramsay and her twin siblings Jack and Holly are the celebrity team this time. Across six rounds, the teams go up against each other in a test of science knowledge, invention and creativity.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.

Science monkey superhero Dr Brain pits children and CBBC celebrities against one another in a series of science-based tasks and conundrums designed to discover the 'ultimate brain'.