Main Bortronians • Jet Propulsion (voiced by
Ashleigh Ball) is the title character of the series. He sees the mundane world as a vast and exciting place, and even thinks that words are exciting, such as "surprise", claiming it to be a funny Earth word. He is named after the
Jet Propulsion Laboratory. • Sunspot Propulsion is the Propulsion family's pet. He has a kangaroo-like body, rabbit-like ears, and a raccoon-like tail. Sunspot knows how to read, can talk and sing, and can follow conversations, but often seems confused about what behaviors are expected from a pet. • Carrot Propulsion (voiced by
Kyle Rideout) is Celery's husband and Jet's father. He often stays home while Celery takes the kids on adventures into outer space, as he does not like traveling in the flying saucer. Carrot often cooks wacky dishes such as deep-fried lollipops. • Celery Propulsion (voiced by Meg Roe) is Carrot's wife and Jet's mother. Celery is smart and often takes the kids to space. She normally drives the family vehicle, as Carrot's driving makes her nervous. • Face 9000 (voiced by
Brian Drummond) (voiced by
Dalila Bela in season 1, Vienna Leacock in Back to Bortron 7-season 2) (voiced by William Ainscough (seasons 1-Our Sun is a Star!), Grady Ainscough (in You Can Call Me Albedo-Moon Face), Glen Gordon (in Lone Star 2 - Rocket Kids!-One Small Step), Anthony Bolognese (Space Camp) (voiced by Jaeda Lily Miller) Celery calls him when the van/flying saucer is not working and she needs advice.
Earthies •
Mitchell Peterson (voiced by
Spencer Drever in season 1, David Raynolds in season 2, Dylan Schombing in
One Small Step,
Gordon Cormier in
Space Camp) is suspicious of the Propulsions' behavior and always wants to expose Jet's alien identity, but inevitably fails. In "Holidays in Boxwood Terrace", it is revealed that he only pretends to be mean, is really shy and wants to be friends with Jet, Sean, Sydney, and Mindy, but did not know how to go about doing so. In the end, the kids welcome him into their group. •
Mr. Peterson (voiced by
Ian James Corlett) is Mitchell's father and the self-appointed safety officer for the neighborhood. He, like his son, can be a bit full of himself. He is an expert at playing mini-golf. •
Dr. Rafferty (voiced by
Keegan Connor Tracy) is a scientist and Sean's mother. •
Dr. Bergs (voiced by
Brian Drummond) is Dr. Rafferty's coworker. •
Dr. Melendez (voiced by Meg Roe) is Mindy's mother. •
Lillian (voiced by Amelia Shoichet Stoll) is a friend of Mindy's. The two girls dig a small "Grand Canyon" in a sandbox while the Propulsions and the other children visit
Valles Marineris on Mars. •
Beep is a robot who lives at the Deep Space Array (DSA). She has a twin sister, Boop, who is a Rover on Mars. •
Dr. Skelley (voiced by Brenda Crichlow) is Sydney's mom, who also works at the DSA. Like her daughter, she is also a fan of Commander Cressida. She is a robotics engineer.
Space Camp •
The Great Galacto (voiced by Mark Oliver) is Jet's idol. He's a TV and web personality who goes on daring space adventures. Like Sunspot, he is allergic to comet dust, which causes him to shrink. •
Stella Singularity (voiced by Viva Lee) was the Great Galacto's number-one fan until Jet took her place. Stella got jealous, and went to planet Earth to confront Jet, but winded up going to space camp, and was placed on Mitchell's team. Stella is sarcastic and narcissistic; she always wants to be the best at everything, does not understand teamwork, and is frequently seen primping herself. When she got stuck in a web in the caverns of Mascarpone, she realized the value of teamwork. From that point on, she apologizes to Jet for how she acted and is nicer to him and the others from that point on. •
Dr. Chandra (voiced by Ana Sani) is an astronomer and "expert on alien life", who visited Boxwood Terrace to judge the spaceship design contest at space camp. Mitchell tried to tell her that Jet is an alien, but to no avail. •
Aurora (voiced by Diana Tsoy) and
Houston (voiced by Gabriel Jacob-Cross) are two kids who invite Mitchell and Stella to join their team. They love space, and emphasize the importance of teamwork. ==Development==