The band are supposed to be performing at the bandstand tonight, but they have fallen ill. Luckily, the Three Bears are happy to step in for them. There's just one problem... they don't know how to play the instruments! Which of the drum, double bass and the trumpet do they strum, blow and bash? Go and Stop realise that they need the aid of the Do Blocks to solve this problem. 

When visiting Secret Agent Chicken at the barn, Go and Stop discover that she has a special mission for them. She gives Go and Stop a map to help them get to her secret hideout. Meanwhile, she is off on a different mission and leaves them to work things out on their own.