TV Guide CBBC Friday

A special visit from the Mayor means that his chains need putting away safely, while he goes for a swim. As head of security, Mick locks them in Joy's safe, but due to his forgetfulness, Danny and Mick now need to work out another way to retrieve them before the mayor returns

Dr Chris heads to the Emergency Department to find how the doctors know who to treat first, while in Accident & Emergency one patient arrives by air ambulance after a rugby match and another has a cut on her foot after it was caught in a bike wheel. Plus, the doctors reveal how amazing saliva is

An episode featuring everything from the creation of the number zero to the beginnings of the whole universe. The moon gets lonely, there's an ISS cookery competition, and DI Loofah arrests a banana.

When Kwazii discovers a blue whale with an injured tail, the Octonauts attempt to use a giant net and Octofloats to keep it from sinking. Meanwhile, Peso and Tweak collaborate on a special brace for its tail, and Kwazii, Dashi and Shellington try to find it enough food. But when the supporting net breaks, the Octonauts have to launch an emergency free-fall rescue!

Michelle is dissatisfied with Emily's dance studio philosophy and starts her own team, discovering some surprising new talent. Meanwhile, Noah tries to help Piper adjust to dancing under Emily's new direction at TNS East

Everybody gets jealous when Boy bakes amazing cookies that he only shares with his new pen pal, Gretchen. They band together and pretend to be Gretchen, writing letters to Boy and asking him to send more cookies, which they then intercept and eat for themselves. However, when Boy asks to meet Gretchen in person, Girl, Dog, Cat, Mouse and Cheese come up with a plan to impersonate her and steal Boy's cookie recipe once and for all

Nitro, Fire and Hammer prank a dad who thinks his son is meeting the Gladiators. However, when Hammer doesn’t appear, he is asked to put on a fake wig, beard and costume and stand in!