After learning their field test is suspended because they aren't ready, the Space Cases try to prove themselves by making contact with the Christa, an alien ship outside Star Academy. While Commander Goddard and Miss Davenport look for them on the ship, the Christa is pulled through a spatial rip sending them all on a journey they learn will take over seven years to return home.

After rescuing a teddy bear from Space for Rosie, Radu discovers a plot onboard the ship. But is it true or is he just imagining it?

The students are just beginning to get used to their lives onboard the Christa. But wait, are those torpedoes heading toward the ship?

Harlan and Radu encounter a person in distress, but she's a Spung! She says she's an oracle and her predictions are coming true, but will Radu learn to trust her before the Spung Killcruiser coming up on them kills them all?

After playing a practical joke on Commander Goddard and Ms. Davenport, the crew of the Christa find out what their twelve-year-old selves were like when they turn into kids.

After Harlan tells Radu he's going to pretend that Radu's invisible, Harlan himself disappears. He soon finds that the ship's crew is in danger and he can't do anything about it. Will Harlan be able to inform the crew before it's too late?

After getting into a fight, Catalina's invisible friend Suzee disappears and Catalina inadvertently puts the ship in danger. Will Suzee come back and help save the day or will Catalina find she can do it on her own?

When Bova announces it's his birthday, Radu says it's his too, out of jealousy because he doesn't know when his birthday is.

The crew gets a message from the future, but because of an ionic storm, much of it is incomplete. Catalina starts assuming things and gets the rest of the crew to put Harlan on trial. Meanwhile, it seems that the crew has slipped into a parallel universe where everyone is Spung, and now they have to run from Commander Goddard and Miss Davenport while still trying to figure out the message from the future!

Sofiana, aka Jack, a prisoner of the colony Luff, sneaks aboard the Christa and switches places with Catalina. They later find out Catalina is about to blow up! Can the crew save her in time?

Dram, an old but sweet man, comes aboard the Christa, acting like he's from the Middle Ages, and mistakes Catalina for his daughter Mirabella. He also says there's a creature on board that is draining everyone of their energy. Is he just a crazy old man, or does he speak truth?

Bova and Miss Davenport hear Thelma talking one night, and find a secret room they never knew about. Bova and Miss Davenport explore it, but Miss Davenport disappears. Thelma then runs away. Can they get Thelma and Miss Davenport back, or will they have one less android and a computer for a teacher?

The Christa rushes to another ship, identical to the Christa. It's the sister ship and it had sent out a distress call. Commander Goddard, Harlan, Radu, and Catalina board it with Thelma, leaving the others to stay behind.

The Hil people mistake Harlan for their king and want him to defeat a centuries old monster. So he, Thelma, Rosie, Radu, and Suzee go to defeat the monster. Meanwhile, Miss Davenport and Bova are trapped inside a huge fruit. The monster turns out to be a little boy (over the age of 200) who is scared of the Hil people, and is the last of his kind. Harlan makes everybody happy, and the Hil people give them more food.

Radu has a dream where Elmira warns them that they are in danger. However, nobody believes him. There's a message that says that the Christa crew can prepare to go home, but Radu says that it's fake and that they are all in trouble. Suzee finally reads his mind and discovers that they really are in trouble.

The Christa runs into an enemy the crew could have never imagined--themselves! Can the crew defeat their evil selves, or will evil actually prevail?

Bova says he's the oldest man alive as a gag, and he becomes popular on the planet Neon. But how will Utz react when he discovers that Bova's been lying?

While crew is collecting things from space they see an asteroid coming toward them. At first they're scared but they calm down when they realize it's a practical joke. They have accidentally brought onboard a cute little pet thing through the vacuum. The pranksters tell them it is a monster but the crew doesn't believe them. The pet has a big appetite and wants to eat everything onboard. It grows into a monster but the crew is able to flush it into space before it eats them.

Rosie becomes a tattletale during a game of Truth or Doom and Suzee swears that she'll never speak to her again. Then the kids sneak out and a sulfur storm comes, but Rosie is undecided about telling everyone; she doesn't want to look like a snitch. Will Rosie tell to save her friends, or stay quiet and no longer be a tattletale?

Radu and Bova get to go on a "boring" mission with the Starling 9 because Harlan and Suzee didn't want to go. Things go smoothly, until Suzee acts too smart and Harlan acts like a hotshot, and as a result, the Christa becomes a runaway! But what's worse is Harlan clipped the Starling, and Radu and Bova are running out of oxygen! Can the crew work together and stop the Christa before it runs out of fuel and save their friends before they die?

The Christa heads into a sector of space controlled by Ma, an energy-sucking monster. Ma steals the energy of everyone besides Radu and Thelma, and Ma is draining Thelma's energy! Can Radu save the day?

The Christa makes an encounter with a space station with a mind of it's own named Pezu after it was attacked by Spung. But the problem is that Pezu wants Suzee for herself, and is putting the Christa in danger to get her. Can the crew escape Pezu before the Christa is destroyed?

The crew meets Catalina's friend, Suzee, and crash land on a strange, uncharted planet.

While out exploring, Rosie and Harlan find a strange creature. Harlan tells Rosie to put it back, but then the Spung attack and Rosie takes it with her. Harlan tells everyone what happened as Rosie tries to hide the creature, but Suzee finds out. The girls discover it's a Rhombi, and that you can get telekinetic powers by drinking it's spit, and that it's primary hunter is the Spung.

Miss Davenport sure has gotten a big head lately! She overloaded her brain and heard the crew talking about how they would like to be each other, and so she grants their wish. Problem is, when they want to switch back, Miss Davenport says she can't do that. Can the crew get what they want, and will Miss Davenport's head ever return to its normal size?