The now-famous first alien child on Earth, Pleskit, makes his way to Colville Middle School for the first time. Fellow student Tim Tomkins tries to befriend the alien in order to learn more about him. Trouble ensues when Pleskit's bodyguard, Robert McNally, loses tradck of him.
When Pleskit gets nervous in front of the class, his antenna gives off electric sparks, causing the students to believe that aliens have the ability to blow up Earth. This causes the students' parents to panic and try to get Pleskit out of Coville Middle School.
Trouble ensues between Pleskit's parent mentor Meenom and Ms. Thomkins when Ms. Thomkins nearly kills Pleskit by giving him a glass of soda.
Pleskit takes his Grandpa's brain in a jar with him to school, only to lose it in the process. It ends up in the wrong hands- Jordan's.
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In order to help Tim win a science contest, Pleskit bends the rules by using his superior knowledge to help Tim. The boys create a way for cow manure to fuel cars. However, there's trouble when they find the fuel they've created turns explosive and someone has stolen the remainder of it.
There has been a lot of singing going on at Coville Middle School latley and no body knows why. What will happen if no body can stop singing!
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Pleskit brings a strange plant to the Woodlander Jamboree. Trouble ensues when the plant starts to turn all of the Woodlanders into zombies, including Pleskit.
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It's Valentine's Day and Pleskit creates a magic powder to make people fall in love with each other. The plan goes awry when Mrs. Weintraub falls in love with Principal Grand, and Lindy falls in love with Pleskit instead of Tim.
While Pleskit is at the Thomkins apartment with Ms. Thomkins, his electrical energy makes all of the appliances in the apartment go crazy.
Tim becomes trapped in the body of what he will look like when he becomes an adult.
Tim brings his hero Captain Driscoll from the Tarbox Moon Warriors to life, and takes him to school. However, when Jordan steals the solution that was used to bring Driscoll to life, it gets spilled and a spider becomes giant.
It's Pleskit's first dance, but it doesn't turn out well when The Blur, Pleskit's fellow female alien nemesis, comes to the school.
When Pleskit has a bad day and realizes that he'll never be accepted, he decides to head back to his home planet.
Pleskit brings a Veeblax (a small, strange animal) to school. After it eats all of Tim's lunch, including bologna (no aliens eat meat), Tim and Pleskit deduce that the Veeblax just must be feeling ill due to gas. They figure out that they're wrong when the Veeblax starts to grow larger than the entire school.