Preston left an egg sandwich out for too long, and now its explosive smell is stinking up the whole town. Mojo and Bo need to evacuate everyone in Swoppiton before the eggy 'stinkplosion'!

Mojo and Bo join the big cross-town race with plans to win. But how can they stay ahead when they have to keep stopping and swopping to help other racers in trouble?

When a lost bird takes a liking to Bo, it is up to Mojo to fly it home. But it's a stormy trip, and Bo will need to do some flying of his own!