Two neighbourhood kids, Sean and Sydney, befriend the new kid on the block, Jet Propulsion, who just happens to be an alien from planet Bortron 7.
Jet attempts to play the Solar System game with Sean, Sydney, and Mindy, but the kids don't quite understand before Jet's mom, takes them on a tour. (S1, ep 1)
Sydney, Mindy, Sunspot and Sean help Jet cook a meal from Bortron 7 for his parents, Celery and Carrot. After some attempts, the kids use the Scientific Method. (S1, ep 2)
Jet explains how his family, the Propulsions, found Earth by way of the Sun, a star in the Milky Way galaxy. Celery takes the kids out into space. (S1, ep 3)
Sydney, Jet, Sunspot and Sean fix up a treehouse and make it into a observatory. The kids build their own telescope so they can all observe the sky! (S1, ep 4)
The kids learn how all the planets both orbit around the Sun and rotate on their own axes at the same time. (S1, ep 5)
Jet attempts to grow a seed from his home planet, but the light from our Sun is stronger than the light from Bortron 7. (S1, ep 6)
Sean explains to the others that Earth is a Goldilocks planet because it's not too hot and not too cold. (S1, ep 7)
Jet, Sean, and Sydney visit their Mars Robot Rover friend, learning how energy can be captured from the Sun. (S1, ep 8)
The kids take a trip to the Moon and learn that falling asteroids probably created all the craters on the Moon's surface! (S1, ep 9)
Led by Sydney, the kids build a moon base in Jet's backyard and use their imaginations to figure out what challenges they would face with life on the Moon. (S1, ep 10)
How Come the Moon Changes Shape: When Jet, Sydney and Sean have a hard time explaining the phases of the Moon to Mindy, Jet's parents, Celery and Carrot, fly them out to space. (S1, ep 11)
Jet, Sydney and Sean decide to have a sleepover in Jet's backyard. They use Sean's telescope to look at the night sky and learn why stars twinkle. (S1, ep 12)
Sean tells Jet, Sydney and Mindy about the Apollo 11 mission, and the kids decide to do a real-life reenactment of man's first mission landing on the Moon! (S1, ep 13)
Jet gives a birthday gift to Mindy that allows her to defy gravity. She has so much fun hovering, the others have to convince her to return. (S1, ep 14)
Beep is sad because her sister rover on Mars, Boop, is sick and can't move. Celery flies the kids out to Mars to try to help. (S1, ep 15)
Jet learns what chores are, and he and Sean help Sydney turn her chores into science games! (S1, ep 16)
Celery and Carrot need to update their guidebook about Mars, and the kids join them on a trip to see how much things have changed over time. (S1, ep 17)
Jet builds a robot version of himself, so that he can be in two places at once! But Jet learns what jealousy is when the other kids seem to be having more fun with Jet 2. (S1, ep 18)
Mindy is shocked to learn that there is more than one moon in the solar system. Celery flies the kids out to Mars so they can see what its moons look like. (S1, ep 19)
Sean and Sydney take Jet to meet Sean's mom, a scientist, at the Deep Space Array. She explains that they're looking for stars with their own exoplanets. (S1, ep 20)
When Jet and Sydney interrupt Sean doing some training in his backyard to eventually lead a mission to Mars, Jet suggests they just have his mom fly them. (S1, ep 21)
Sean is trying to work on a science project for Space Troops, but is interrupted by his friends' noise. His search for a quiet place leads him to a discovery. (S1, ep 22)
Celery takes Jet, Sydney and Sean on a trip to explore Saturn's rings to learn what they're made of. (S1, ep 23)
When Sunspot goes missing in the neighbourhood, Sydney, Sean and Jet use the North Star to navigate their way to where he is. (S1, ep 24)
When the Propulsions watch a slide show of the Petersen's vacation to the Grand Canyon, they decide to take their own trip to Mars to see Valles Marineris. (S1, ep 25)
Sean and Sydney take Jet to the DSA to see a show at the Planetarium. But things take a turn when Jet upgrades the show with Bortronian technology. (S1, ep 26)
Sunday Drive - Part 1: The Propulsions hit some teething issues after they download their new version of their saucer dashboard operating system! (S1, ep 57)
Celery's brother and his pet, Moonbeam, decide to visit the Propulsions, but get lost along the way. (S1, ep 27)
After Mindy and Sunspot watch a weather report, misinformation about a huge storm system on Saturn spreads and mayhem ensues. (S1, ep 28)
Sean sets up a sno-cone stand to help raise money to send a spaceship to Mars. (S1, ep 29)
Jet builds a flying saucer and wants to test it; but to succeed, he has to learn what gravity is, and how it works. (S1, ep 30)
Mindy and Carrot enter desserts representing the different planets of the Solar System into a cooking competition, but they hit a bump in the road! (S1, ep 31)
Jet builds an electric engine from scratch for the annual soapbox derby competition, but Mitchell is suspicious that Jet is using alien technology! (S1, ep 32)
Sean wants to beat his mystery competitor at a video game and realises that the best way to learn about asteroids is to see them for himself! (S1, ep 33)
When Mindy and Sunspot are digging in the yard, they discover a unique rock that Mindy is convinced is a meteorite. (S1, ep 34)
The neighbourhood is having a star gazing party when Mindy discovers what may be a new comet! (S1, ep 35)
When Sean learns that asteroids are floating around the solar system, he decides to set up a homemade asteroid watch-station in the treehouse. (S1, ep 36)
When Sean, Sydney, Jet, and Carrot head out to view the Northern Lights, Sunspot agrees to let Mindy be his pet sitter. (S1, ep 37)
When the kids realise that they all want to use the treehouse at the same time for different activities, arguments break out. (S1, ep 38)
When Jet realises that it's the anniversary of Carrot and Celery's first date, he wants to recreate that first picnic they had on one of Bortron 7's moons. (S1, ep 39)
When FACE 9000 gives the kids mixed-up directions, they learn that it is time for it to get upgraded! (S1, ep 40)
When Mindy worries about the possible addition of a younger sibling to her family, Jet tells her that on Jupiter's moons, families have more than 60 children! (S1, ep 41)
Mindy is so excited about presenting her kid model of Pluto at school that the other kids don't want to disappoint her by telling her that Pluto isn't a planet! (S1, ep 42)
Sunspot is determined to get to Jupiter to meet his fellow pet aliens, other members of the Red Spot Club. (S1, ep 43)
Uncle Zucchini finally gets to Earth for a visit, just as the Propulsion parents are called away on a work assignment. (S1, ep 44)
The kids try to dig into the centre of the Earth, but then they discover that the centre is really hot and the layer leading up to it is solid rock! (S1, ep 45)
When Mindy can't sleep because of a strong smell, Sydney, Sean, Jet, and Sunspot put their detective hats on and try to work out where the smell is coming from! (S1, ep 46)
Sean wants to be the first to walk on a moon, like his hero Neil Armstrong. Our moon has already been walked on, so he decides to visit another moon! (S1, ep 47)
Mitchell's mother declares the kitchen counter a "black hole" because she can't find her sunglasses and she's sure she left them there! (S1, ep 48)
Enjoy a rollicking, song-filled recap of the Propulsion family's mission to Earth! (S1, ep 49)
Mr Petersen and Mitchell go camping with Carrot and Jet. The two dads have opposite approaches on everything, from setting up tents to preparing food! (S1, ep 50)
An Earth-orbiting telecom communications satellite breaks down, and satellite TV service in Boxwood Terrace stops working! (S1, ep 51)
The kids discover that they can use links to different websites to see a satellite view of their house! (S1, ep 52)
After learning about space junk, the kids are determined to help do their part to clean up their space neighbourhood. (S1, ep 53)
Jet becomes obsessed with paper airplanes after he watches Sean casually fold one! (S1, ep 54)
The kids help Dr Rafferty and Bergs get Mars Rover Boop over a ravine on the red planet by simulating actions in the DSA Mars Yard! (S1, ep 55)
When Mindy thinks she's found her own star, the other kids explain how stars are labelled and identified by constellations. (S1, ep 56)
The Propulsions' issues with the new version of their saucer dashboard operating system continue! (S1, ep 58)
While Mindy, Jet, Sean, and Sydney are trying to use a solar panel to improve their energy efficiency, they notice that Sunspot is acting strange. (S1, ep 59)
Sean is excited by NASA's Year in Space program on the ISS and decides to try to live for a year in the tree house without ever coming down. (S1, ep 60)
Jet's First Halloween - Part 1: Sydney, Sean and Mindy help Jet experience his first Halloween by carving pumpkins, dressing up in costumes and going trick-or-treating. (S1, ep 61)
Jet's First Halloween - Part 2: Sydney, Sean and Mindy help Jet experience his first Halloween by carving pumpkins, dressing up in costumes and going trick-or-treating. (S1, ep 62)
Whole Lotta Shakin': The kids and Sunspot attempt to build the tallest tower ever on the Moon, but the Moon's surface shakes while they are building! (S1, ep 63)
The kids try to train Jet to behave less like an alien from outer space ahead of his visit to the DSA Open House! (S1, ep 64)
As the rest of the kids get ready for Valentines Day, Mindy continues to feel sad that little, frozen Pluto is so far out at the edge of the solar system. (S1, ep 65)
Sydney directs the kids in a backyard movie, making her version of a Commander Cressida story about the formation of a star. (S1, ep 66)
Mindy's mom has gradually been giving Mindy permission to go farther into the neighbourhood on her own, so Mindy tries to map out her boundaries. (S1, ep 67)
Sydney knows a lot about Boxwood Terrace's early history, and she tells Jet stories about a local pioneer who went by the nickname Lone Star. (S1, ep 68)
Jet, Sydney, Sean, and Sunspot join Celery as she competes against her brother, Uncle Zucchini, in an 'Earthie-style' race. (S1, ep 69)
Jet makes a time machine so he and his friends can go back to an exact time - 3 minutes earlier - in order to see a meteor shower that they missed. (S1, ep 70)
Sean's nervousness about flying out to visit the remote Neptune is soothed by Jet's suggestion to come up with a fun song about the planet. (S1, ep 71)
Earthday Birthday: When the kids discover that they've missed all 63 of Jet's Bortronian birthdays, they celebrate the one-year anniversary of him landing on Earth instead. (S1, ep 72)
While flying back to Earth after an afternoon on the Moon, Celery, Jet, and Sunspot discover that they have mistakenly left Carrot behind! (S1, ep 73)
The Propulsions are woken up with a jolt when a loud thunderstorm hits the neighbourhood one evening. (S1, ep 74)
Holidays in Boxwood Terrace - Part 1: Jet pitches an idea for the annual Boxwood Terrace Christmas Pageant, and not only is it accepted, he gets to direct it! (S1, ep 75)
Holidays in Boxwood Terrace - Part 2: Jet is looking for the Spirit of Christmas, something intangible that Sean and Sydney can't quite define. (S1, ep 26)
The kids get information from Dr Rafferty and then travel to outer space to confirm the amazing fact that there is no sound in outer space! (S1, ep 77)
After Mindy laments the fact that she's still only 4 and still can't go to space, Sydney, Jet, Sean, and Sunspot create a makeshift 'Day in Space' in the yard. (S1, ep 78)
Sydney shows Jet and Sean a cool experiment - dropping different items from the same height to see which reaches the ground first. (S1, ep 79)
Sydney brings Jet and Sean to the DSA to meet her mum Dr Skelley and check out her work on space robotics and gadgets. (S1, ep 80)