Helen and Barney compete against one another to raise money for Children in Need.
The Blue Peter team investigate what factors make a hit video game.
Britain's Got Talent runner-up Ronan Parke performs his new single, with help from Barney.
Helen goes to a zoo to discover the culinary delights that are fed to the animals.
Ed Sheeran is in the studio, and Jacqueline Wilson tours her new exhibition.