The Joke Machine is an interplanetary craft manned by the Joke Master, who is in search of the UK's best jokes. Where better to look than the school playground?

In each episode, children from two schools are beamed up into the Joke Machine and compete to tell the best jokes. However, if they fail to amuse the Joke Master they get a comedy punishment.

From smoke, splats, stamps and blasts, the feisty banter between master and joke teller can lead to unpredictable consequences.