To enroll in school you need a parent--even if you're an alien--so Allen uses his powers to cough one up. Meanwhile, Robbie's having school troubles of her own....

Is it safe for Allen to go places on his own? Robbie doesn't think so. She goes to look after him and ends up putting herself in danger!

The Stevensons discover that Allen isn't the only intergalactic visitor to drop by Planet Earth... and the new alien on the block isn't very friendly.

Allen's just found out about Christmas and he's all set to give Robbie the best present ever. But Josh's mistake could ruin the holiday for everyone.

The common cold is just a hassle for humans. But for Allen, who's never had it before, it could be fatal. Meanwhile, Robbie tries out for the varsity track team.

As a new member of the wrestling team, Allen must decide whether or not to use his super strength. Can he do it without blowing his cover?

When Josh and Ken go camping and Robbie goes to visit Gail, Allen's left alone for the weekend. Well, not ALL alone--there's a burglar in the house!

A deadly meteor is heading straight for Earth, and only Allen can stop it. Meanwhile, Josh and Robbie's slumber party pals are on a collision course.

Allen and Josh make a computer that falls in love with Robbie, and there's nothing worse than a lovesick laptop.

Josh and Allen discover a clue that could help Allen get back home. Unfortunately, it's right in the middle of an evil Trykloid lair.

Allen really, really wants to get back home. He sends out a signal to his home planet, but Shaw and Phil Berg track the message.

Before Phil Berg can capture Allen, the Trykloids capture Phil. But the A.R.C. has better luck, and now Allen is behind bars with only one hope of escape.

Allen goes on a journey where he has to show courage, honesty and sacrifice without the use of his powers. Meanwhile, Robbie and Josh are in for a disappointment when their parents announce they're separating.

Grandma Irma's dog is taken over by an alien parasite, which Allen is afraid of but must capture before it takes over Josh and the rest of the human race.

Josh isn't only into UFOs, he's into ghosts too--especially after he and Allen actually MEET one. Meanwhile, Ken and Robbie try to rewire the house.

Allen gets caught in the middle when Robbie has a big argument with the wrestling team.

A piece of mold turns into a living, breathing clone of Moose (only nicer)!

Allen's on an overnight trip with the wrestling team when their bus crashes. What's worse, Ken just sold the Lemorian Pod in a yard sale.

Allen picked up the English language in a day, but English Lit is something else entirely! Now Allen's flunking it--and he could lose his place on the wrestling team.

As Allen, Josh, and Robbie race to get the key that opens the portal which has fallen into the hands of Phil Berg, there's danger in store when Josh gets sucked into the portal.

Allen closes the portal forever, sacrificing his only way home to save Josh - and the planet - from the wormhole.

After Allen gets caught telling lies about his human identity, Robbie helps him create a home out of thin air fir his teacher to visit.

Robbie gets over her parents' separation by changing her room. Meanwhile Allen and Josh run into Phil Berg at the dentist.

Allen has his hands full with an alien girl who has a crush on him. Robbie tries to help out her dad with his money troubles.

As Manfred the mannequin starts to become more and more human, Allen gets annoyed when he starts interfering in his life.