"Mars Rock for Mom": On Mother's Day, Jet realizes that he left Jet 2 on Mars and he and his friends travel there to recover him. "Sean Has a Cold": Sean gets sick on the first windy day of Spring and misses out on kite flying with his friends.
"Sunspot's Sunspot": Sunspot is sick and acts weird. This is because of a big sunspot on the sun. He gets cured when he gets closer to the sunspot. "Our Sun is a Star!": Lillian has a sleepover with Mindy planned, but it's too cold to have a sleepover outside. The kids learn about stars.
"My Three Suns": The kids play shadow tag, but then the clouds cover the sun, making it so that they can't play shadow tag. Then, the kids learn about a planet with 3 suns, Proxima B. They are glad to live on a planet with just one sun. Meanwhile, Face 9000 tries to take up comedy. "Magnet, P.I.": Sean becomes a magician called the Great Seanzo and dazzles the other kids with magnet tricks.
"Moon Face": Mindy thinks there's a face on the moon. The kids investigate to see what causes the 'face' on the moon. "Lone Star 2 - Rocket Kids!": In this sequel to season 1's "Lone Star", the kids design a foot rocket while Sydney tells them about how Lone Star engineered and built the first rockets.
Jet is impatient and uses Bortronian technology to grow a pumpkin. However, the pumpkin becomes enormous and is too big to carry to the local Pumpkin Contest. Jet and his friends need to figure out a way to get it to the contest in time. At the same time, Mindy is going trick-or-treating with her two BFFs: Lillian and Mitchell. Mindy and Lillian think that Halloween is magical. Mitchell, on the other hand, has different opinions. Mindy tries to convince him that it is.
"Water, Water Everywhere": Celery takes the kids on a saucer tour all around the Earth to discover all the ways that water can be found. They visit Antarctica to look at the ice, and then compare that extreme to the icy surface of Jupiter's moon Europa. "Commander Cressida Story Contest": Sydney wants to enter a Commander Cressida story contest, but can't think up a good enough story. The other kids help, and they come up with a story about lassoing a comet to bring water to Venus, and then Mars.
"Earth Wind & Flyer": Jet is fascinated by the effects of wind on his saucer. He and the kids study how wind works, ending with Sean going on a wild saucer ride. "Mini-Golf At The DSA": Jet is fascinated by Earthie golf, and Sean and Sydney try to teach him the rules. When the DSA builds a new mini-golf course, the kids team up against the grownups, and Jet gets to apply his new knowledge of force.
"Asteroid Belt Space Race": The kids join Celery in a space race with Uncle Zucchini, Auntie Eggplant and Zerk. "Sydney 2": Sydney designs and builds a robot companion for Jet 2.
"I Feel the Earth Move": When the kids experience an earthquake in Boxwood Terrace, Celery takes them up into space to study the Earth's plates and fault lines from above. "Zerk Visits Earth": Jet's overactive cousin Zerk comes to Earth for a visit, and the kids show him around the neighborhood.
"Souped-Up Saucer": Celery has souped-up the family saucer, adding new features for the kids to use, including a robot arm. They test drive it with a trip to the Moon. "Pet Sounds": Jet takes care of Mitchell's dog Cody for the weekend, and attempts to teach him some new tricks.
Earth science and astronomy take center stage in this animated series. Two neighborhood kids -- Sean and Sydney -- befriend the new kid on the block, Jet Propulsion, who just happens to be an alien from planet Bortron 7. Together they explore the solar system and how it affects the planet, while also learning about friendship and teamwork.