Summer assumes the role of detective when a heated game of checkers turns unpleasant. Also: While on a field trip to a local art museum, Fozzie's lunchbox is stolen by a mischievous monkey and the Muppet Babies must chase him through paintings to get it back.
Summer and Piggy surprise their friends by building a blanket fort so large that it becomes a blanket kingdom; and when Miss Nanny loses her earring, the Muppet Babies use their imaginations to turn into pirates and follow a treasure map to find it.
When Rizzo the Rat arrives and makes a mess in the playroom, the only way the Muppet Babies can get him to stop is to defeat him in a dance-off; and Summer is tired of being the smallest Muppet Baby and enlists Dr. Bunsen Honeydew and Beaker to help with their Enlarge-O-Ray invention.
The Muppet Babies put on a sporting competition and Piggy must learn how to be a good sport and get back in the game after losing several events; Gonzo becomes best friends with a potato, so the other Muppet Babies include it in their games.
The Muppet Babies use their imaginations to take off on an epic adventure to find Miss Nanny, and Kermit helps a dragon get over her fear of the dark; no one lets Animal take the controls on an imaginary flight to Paris.