Iain Stirling hosts and the student team captains are joined by Joe Swash, Ashleigh and Pudsey, Alex Riley and Romesh Ranganathan.

The student team captains are joined by Hacker the Dog, Michelle Ackerley and Johnny and Inel.

The team captains are joined by Sam and Mark, Dodge T Dog and Naomi Wilkinson.

The superstudent team captains are joined by Jermain Jackman, Bobby Lockwood, comedian Katherine Ryan and presenter Nihal Arthanayake

The young team captains are joined by Dominique Moore from DNN and Horrible Histories, dance phenomenon Aidan Davis, Alex Riley from Junior Vets and host of Extreme School, Susan Calman.

Our super-student team captains are joined by stars of Sam and Mark's Big Friday Wind-Up, Sam and Mark, CBBC'S Dodge T Dog, and Dominique Moore from DNN and Horrible Histories.

The brilliant young team captains are joined by EastEnders actor Sam Strike, CBBC's Wizards vs Aliens actor Percelle Ascott, and comedians and presenters Susan Calman and Dan Wright.

The super-student team captains are joined by Radio One's Chris Stark and Ashleigh and Pudsey from CBBC's Who Let the Dogs Out? Also with comedians James Acaster and Romesh Ranganathan.

The super-student team captains are joined by actor and comedian Jack Carroll, Wolfblood's top wolf Bobby Lockwood and comedians Lloyd Langford and Pippa Evans.

The super-student team captains are joined by the star of Citizen Khan, Adil Ray, actor and comedian Jack Caroll, CBBC's queen of science, Fran Scott, and comedian and presenter Dan Wright.