A new student arrives at Sandy Bay School, Jack. His only wish is to discover Elizabeth and Toby's secret. Elizabeth has turned Toby's cousin Sasha and Russ into flies. Will Toby come to her rescue when she's held by a giant koala?
Elizabeth's experimenting ends up making Sasha's teeth fall out in the bathroom sink. Thinking Garth will leave her as her sidekick Elizabeth causes him to grow breasts until he joins her for good. Will Elizabeth ever learn?
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.
After Elizabeth gets a deadly fever from Verity, she must do everything anyone ask when needing help. Soon finding out that she could die she requires Toby's help. Will Toby save her.
Toby ruins Niki's project and his friends try to help him win back Niki by imposing as Toby and giving her a new one. But Elizabeth notices something is up.
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?
Elizabeth is forced to move her gadgets from her lab temporarily. In a mixed turn of events Jack finds them. Now that he is closer than ever to Toby and Elizabeth's secret, what will they do?
After Niki gets criticized by her swimming coach, she tells Toby not to worry about it and says it's a confidence thing. Toby makes her a confidence ring, but when Russ puts it on, he refuses to take it off, until he loses it.
Because no one trusts Jack,he makes sure that Toby and his friends are all distracted so that he can take a peek in Toby's shed. But will he end up regretting this?
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?