Mindy celebrates her fifth birthday with her first space trip aboard the Propulsion family saucer and a tea party on the moon.
Jet flies from the Northern Hemisphere to the Southern Hemisphere to experience holidays in winter and summer on the same day; Jet and friends use a shrink-ray to become small like Mindy.
Jet, Sean, Sydney and Celery retrieve ice from Saturn so they can build a skating rink for Mindy; the gang decides to make a scaled replica of the solar system.
Mindy and Carrot are launched into space when Carrot accidentally pushes a wrong button on the wagon's new control panel; Dr. Skelley presents the first edition of Commander Cressida comics.
Mindy asks Jet and the others to help her keep the sun from going down; Sean portrays Galileo for a school report.
Bad weather threatens Sean's first sleepout with his Space Scouts troop; the kids prepare a total eclipse song and dance.
The kids take the souped-up family saucer on a trip to the moon; Jet attempts to teach Mitchell's dog some new tricks.
After an earthquake, Celery takes the kids into space to study the Earth's plates and fault lines; Zerk, Jet's overactive cousin, visits Earth.
The kids join Celery in a space race with Uncle Zucchini, Auntie Eggplant and Zerk; Sydney designs and builds a robot companion for Jet 2.
Jet and the kids learn how wind works; Sean and Sydney try to teach Jet how to play golf.
Jet takes the kids on a saucer tour to discover all the ways water can be found; Sydney needs help coming up with a good story to enter the Commander Cressida story contest.
Jet 2 needs new wheels in order to successfully navigate on Mars; the kids design solar-powered karts.
The kids learn that some things are easier to see in the dark than others; the kids visit the beach and learn about the tides.
Two neighbors befriend the new kid in town, who just happens to be an alien.