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. 

Frog is on his way to band practice, but he has a problem - how can he cross the muddy stream that blocks his path? Go and Stop have helped Arty cross it before, so they are confident that they can help Frog too. Listening to the Moving Crew, Frog leaps from stepping stone to stepping stone. He almost leaps onto the grass on the opposite bank when he realises that he'll land on a bunch of bugs. What can they do?