Elizabeth gets revenge on a famous Hollywood actress who starts attending their school by playing a childish prank.

Garth's prankster cousin Rodney pays a visit. Whilst staying he manages to not only annoy everyone, but also turn into a half-man half-spider (Spiderboy).

Toby has to meet Nikki's parents. But Jack and Elizabeth have teamed up to make it a disaster.

Russ is convinced he is a loser, so Toby helps by building a time machine so Russ can see his heroic ancestors. But it all goes wrong and Russ is time-swapped with a man from prehistoric times. Will Toby be able to save Russ?

Toby tries to prove he is a genius by creating an anti-gravity machine, and fixing it to the school's ride on lawnmower. Elizabeth sabotages Toby's plans to make sure no one finds out they are both geniuses.

Toby's nanna is sent back in time through a wormhole generator, and a younger version of Toby's nanna comes through the wormhole, destroying the generator.

Elizabeth and Dina both run for Class Rep. Elizabeth uses anti-friction spray on her competition, putting Dina in a dangerous position.

Toby creates a robot Dina, so she can be on her date with Sean and work her shift at the same time.

Toby creates a remote control that allows him to win an arcade game, but the game goes berserk.

Toby finds the correct sequence, called the genius key. He accidentally turns Russ into a genius.

Toby uses his flying machine to help Russ, but doesn't know Jack is watching. Meanwhile, a dog-lover offers to donate money to the school. How will Jack try to blackmail Toby for the genius key this time?

Toby modifies the MFE machine to scan for Bianca in a rocky landscape. He finds a rock that reacts strangly with the MFE.

Elizabeth teams up with Garth to put some muscle into her plans.

Elizabeth zaps herself and Toby into a virtual reality game. Meanwhile Sasha gets reunited with her childhood horse.

Toby decides to create a visual memory for Russ who holds the missing element of how he and Elizabeth became geniuses.

Elizabeth takes Bianca captive in the hope Toby will give her the genius key, or she will use the shrink ray on Bianca.

Elizabeth reveals a T-rex to a press conference at the school, but the T-rex rampages through the school. Toby creates a giant doll to fight the T-rex, and the doll wins. Toby zaps himself and Elizabth with the MFE, removing their genius. However, Elizabeth still has the genius key in the pocket.

When Toby wants to get into the swim team to impress Niki, he makes a formula that makes him swim like a fish. But what will happen when Elizabeth finds out

Toby ruins Niki's project and his friends try to help him win back Niki by impossing as toby and giving her a new one. But Elizabeth notices something is up.

Elizabeth creates a freaky machine to be her new assistant, but it becomes consumed with the idea that he must protect Eliizabeth and soon her safety is in danger.

Elizabeth, in her basement lab uses too much power and Mr Tesslar tries to track it down, but she sets up Toby and Russ to keep the location of the basement lab safe.

Toby intercepts Elizabeth's teleportation machine, and Toby is teleported to Elizabeth's secret lab.

Elizabeth frames Dina vandalising Mr Tesslar's car, in the hope she will be demoted as Class Rep.

Toby and Niki finally go on a date, but Elizabeth has a plan for them. Jack sees one of Toby's inventions and tries to get it for himself.

Sasha and Russ accidentally swap bodies after messing around with one Toby's inventions.They learn to appreciate each other's good qualities.