Loonette and Molly spend the day discovering light and heavy things. After reading a story about a balloon, Loonette finds a balloon of her own, which she thinks can lift her off the ground. She's too heavy, of course, but the balloon does lift Molly off the couch and into the garden.

Molly's birthday is approaching. She and Loonette hold a birthday party with games and costumes. They also have fun with big things compared to little things, particularly with a story about a gigantic cupcake.

The show opens with a flashback: Loonette and Molly can't sleep. They venture around their house during the dark before Loonette reads her about a Sleep Train's magical adventure. The next day, Loonette discovers Major Bedhead asleep on the job.

When Molly catches a cold while skiing, Loonette decides to knit her some new mittens. But when the yarn becomes a tangled mess, Loonette abandons the task and retreats to Granny Garbanzo's garden. Granny tells a story of how she had to practice knitting as a child. This gives Loonette the confidence to keep on trying.

Loonette gives Molly a special heart balloon, but after a short amount of play, the balloon flies away. At Granny Garbanzo's garden, Loonette, Granny, and Major Bedhead have fun playing circus with a single rope. At the end of the circus routine, the heart balloon returns to Loonette, which brightens Molly's day.

When Molly flops over on her back, Loonette criticizes her for being lazy. But Loonette gets into a floppy mood, first by imitating a toy, and then by reading a story about a Poppy growing all by herself.

Loonette and Molly make-believe they are fishing on a boat, complete with lifejackets. With so much inactivity out on the pretend lake, Molly has to learn patience.

There's a big mess over at the couch. Unbeknownst to her, Loonette has brought an entire roll of toilet paper from her shoe to the couch. The pile-up is enormous. But that's not nearly as colossal as the big package Auntie Macassar sent. Beneath all the packing material are a few tiny cleaning items. With that search ended, Loonette and Major Bedhead, along with Granny Garbanzo, go into a routine called ""Slam-Dunk Your Junk.""

It's time for a few stop-and-go games, plus a pretend ride in Loonette's pretend car.

Loonette starts out with a bad case of nosus kaboomis, a monster sneeze. She decides to vacuum the room, prompting Molly to retrieve the dust bunnies trapped in the vacuum cleaner. Outside, Loonette's monster sneeze helps Major Bedhead get his head out of a tuba. She then flies a kite and reads from the storybook to discover the power of wind.

An energetic Loonette promises to read Molly a story, but she gets too distracted with all the bouncy things in the couch (and a few that don't bounce). When a ping pong ball bounces away, Loonette follows it outside, where Major Bedhead delivers a box of ping-pong balls.

Loonette shows her feelings with her face and compliments Molly's good looks. When they see that Granny Garbanzo has received a movie from her relatives, they watch and discover good feelings abroad.

Loonette gives Molly a nature lesson/puppet show, demonstrating how a caterpillar turns into a butterfly. At Granny Garbanzo's garden, Loonette learns the right way to handle pesky insects.