Samuel and Rudy are going to race each other in a seedbox derby! But as the race nears, the two best friends become increasingly competitive. In an unlikely turn of events, Muffin wins the race.

Elliot gets stuck aboard a runaway Muffin Express! Though Samuel and Rudy attempt to rescue him, it is Muffin who finally saves Elliot and stops the runaway train.

Rudy leads Muffin and Samuel on an expedition to the moon! They get astronaut outfits and Quinn gives them a rocket ship. But as they're about to take off, Mr Beakman explains to the kids that they can't possibly fly to the moon. The kids get Mr Beakman to come with them... to a papier-mâché moon Rudy has made in the tree!