Josie and Vaughn are transported through the wormhole in Professor Z's office and find themselves in 1977, where they meet their scandalously young principal and a teenage version of Vaughn's dad, Victor. Josie soon discovers that Vaughn has a hidden agenda: to see how his parents first met. But when Vaughn disrupts the timeline by stealing an object from the past, Josie returns to the present to see that Blake Holsey has drastically changed. Will Josie be able to find a way to change things back, or will she be stuck in a strange version of the present?

Marshall is sick, feverish, and to make matters worse he uses all of his spare time working on a new money making scheme. While he feels awful, his new venture, which was doing extremely well and making profits, bottoms out. Bizzarly, even the school develops symptoms of Marshall's infection. Some parts are too cold, others overheat, sneezes and coughs begin occurring from deep inside the school and a greenish slime extrudes from the interior, exactly like Marshall's symptoms. But why does it occur? And when will it stop?

Josie is determined to find and rescue Vaughn at all costs. Josie locates Vaughn, and they return to the present. Josie believes everything is her fault because Victor stole the ball from her. And decides she must prevent the accident at Pearadyne from occurring. Only, once she does, everything may never be the same, and she faces an unexpected reality.

After continuously losing at hearts, Lucas modifies a new pair of glasses so that he can see through the cards. However things go awry when he becomes able to see through everything. He starts running into things because he can't see they are there. Though, still mistrustful of Vaughn, he decides to investigate his suspicions before seeking help for his impending blindness.

When certain members of the school start behaving oddly, it is clear that Tyler is behind it. Could he have gained the power to camouflage himself as others?

The class chooses elements for their projects on the periodic table. Little does Marshall know he will take on characteristics of several elements as he struggles with the legacy of his brother, who Marshall does not like, when he comes to Blake Holsey for a visit.

Vaughn gets beaten at an arm wrestling match and Lucas is jealous of the amount of attention Josie pays to Vaughn. But when Lucas and Vaughn gain confidence in themselves after Vaughn wins another arm wrestling match and Lucas beats a rival at chess, could these new health bars play a factor? After the two score very poorly on their midterms and lose self confidence, Josie convinces Professor Z that Lucas and Vaughn need to get a better diet.

Welcome to Blake Holsey's first annual pizza party! Attendance by all is required, but Josie, Corrine, Marshall, Lucas, Vaughn, and Professor Z suspect Durst wants to keep them occupied while Victor Pearson initiates a devious plan. Their suspicions are confirmed when they discover a team of scientists outside the school. Josie is amazed when she sees that one of them is her Mom, Kelly Trent. Then, Kelly conducts tests which send Josie into the Wormhole, taking her back in time to three hours earlier! She must inform her Mom about the potential dangers of a fatal discharge of electricity! And she must race against time...

Marshall gets into the cell phone business, but when his business partner, Tyler, wants to use Marshall's special smiley code to cheat on a test, Marshall actually complies. Marshall feels guilty afterwards and Tyler warns him not to tell, but Marshall's new invention turns against him: he can no longer talk understandably. To make matters worse, Professor Z and Principal Durst know Marshall cheated on the test with Tyler...

A strange occurance in the science lab causes Marshall's phone, a laptop, and Z's camera to shrink to nano size. Intrigued by Tyler's strange behaviour since his discovery of the worm hole, the science club decide to take advantage of the nano-sized camera, and plant it on Tyler. However things become complicated when Josie accidentally swallows the camera.

Durst doesn't think Z is being hard enough on his students so decides to take his science class for him to check it out. Josie, knowing Z will go easy on her, cuts class- again. While durst is teaching the class about chirality- mirror opposites- she smells the experiment's resulting liquid and becomes more laid back, just as Z is. Unfortunately the smell also gets to Z, who in turn becomes more strict that Durst ever was. Soon he becomes the acting principal of Blake Holsey, and is giving out detentions for every minor offence. The science club members must figure out how to reverse the effects before Z gets too out of control...

Blake Holsey can be really difficult for a student like Lucas who, despite his grand intelligence and great sense of humor, gets bullied for being a little eccentric. He wishes that he could be an adult, and as a result of an abnormal mayfly bite, his wish is granted. Lucas enjoys his short time as a grownup, but begins to realize that he is rapidly aging at the same rate as a mayfly does. Will Lucas be able to reverse the process and return to normal before it is too late?

Josie just can't seem to become organised enough to finish her robot building project, which annoys Corrine since they are partners. However, Josie astonishes everyone when she actually creates a robot that will clean. When it goes too far, Josie tries to turn it off which sends the robot's programing to a default program that not even Josie would want to be...

The class studies DNA but one of Lucas' chromosomes gets changed. Becoming more assertive, Lucas gets himself into a lot of trouble, as well as accepting Stew's challenge to a fight.

When Corrine's venus fly trap is left uncovered and alone in the science lab, it becomes a girl. Under the name Diana, she attends several classes at Blake Holsey, and immediately has all the boys competing for her attention. However it is Marshall that she takes a special interest in, which upsets Corrine. The other girls also don't seem too impressed with this new stranger...

A wormhole opens in an office floor and the science professor disappears into the wormhole, never to be seen again. Josie Trent experiences an extremely interesting first day at Blake Holsey High when she and her new roommate, Corrine, travel through the same wormhole. Could this give an indication of exactly what occurred to cause the mysterious incidents at "Black Hole High?"

Marshall doesn't want to be the most popular guy at Blake Holsey; he just wants his friends to notice him. But when he begins to feel completely ignored, Marshall finds himself disappearing until he becomes invisible. Although enjoying his newfound ability at first, Marshall starts to realize that he is slowly fading away into nothing. Can he and his friends restore his visibility before he ceases to exist?

For today's lesson, Professor Z uses a beehive to explain the function of pheromones in the hierarchical structure of a beehive. Meanwhile, cheerleader and super-diva Madison, the most popular girl at Blake Holsey, runs for election without any opposition. After last year's humiliation, Corrine fears entering this year's election competition. Frustrated, Josie decides to run against Madison. In desperation, she makes empty promises. Will she win? Then, Josie and Professor Z discover that Madison is using pheromones to control the students and win their votes...

There's just no way Josie could be a thief, or could there be? It's a battle of truth vs rumour, as it becomes intolerable for Josie and Corrine to share the same living space. Meanwhile, the sponge in the aquarium is multiplying and covering the school. Lucas, Marshall, and Professor Z have to get to work before the sponges cover the entire planet...

BHH curfew is five minutes away and Josie is nowhere to be found. Corrine worries because Josie will break curfew by being late and Lucas is aggravated because Josie forgot that they have a science project to finish. And where exactly is Josie? Her first date with Vaughn! But at the very moment they almost kiss, she hears the BHH curfew bell. And she quickly enters BHH where she runs into Durst as she tries to beat curfew and then discovers that her watch can stop time. Actually, from Josie's point of view, time appears to stop for everyone except her. What happens next? Will Josie be suspended in time forever or rescued just in time?

Marshall is testing a rocket but when he launches it, it fails to come down. Instead, a large silver sphere falls from the sky. When the gang go to investigate, the sphere dissolves, leaving behind a strange device. They take it to Z, who also has no idea what it was. When Josie touches it a panel opens up, and a timer begins to count down. Now the science club has 26 minutes to figure out what it does, and what the connection is to Vaughn...

Josie suddenly finds herself in 1879 by way of the wormhole. Vaughn, Lucas, Corrine, and Marshall come to her rescue. All return to the present except Vaughn, who discovers he has returned to a much different yet familiar reality...

Lucas finds an old radio dish in the basement of the school, and discovers that it can receive radio signals from the future. A confusing broadcast is received, and he learns that Blake Holsey suddenly disappears. The Science Club must win the battle against destiny and change the future, or lose all that they hold dear to them.

Josie doesn't like her lack of height. Josie learns the advantages of being shorter than everyone else when she actually shrinks to being four inches tall, despite her efforts to grow. Victor Pearson wants to run some tests on the school.

You are a math prodigy, a human calculator, and extremely intelligent, however you are not a singer. And that's the last thing Corrine wants to hear from Marshall as she prepares to audition for Magnet 360�. But while looking in the mirror to see whether her fear is obvious to others, the mirror is transformed by BHH energy, and Corrine taken to the other side where she encounters opposite versions of her friends. It's a whole new world for Corrine to discover!