Michael Webster vandalizes his father's new cuckoo clock by twisting the bird's head backwards so his annoying, bratty, trouble-making younger sister Tara will get blamed for it.
However, the plan goes wrong when Michael finds himself reliving his disastrous birthday party – and going backwards in time.
Though Michael succeeds as a toddler and returns to his normal self, he inadvertently knocks off the year 1988 which was part of the clock and removes/erases Tara from existence.
He starts taking piano lessons to impress a neighbor, but he realizes something is very odd about his teacher, Dr. Shreek.
But Jerry is about to find out that Dr. Shreek loves to steal the hands of his students... Gabe and his cousin, Sari, are trapped in a pyramid belonging to an Egyptian princess disguised as a modern-day journalist who is controlling a four-thousand-year-old mummy.
Amy Kramer receives a replacement ventriloquist dummy named Slappy, who she accidentally brings to life.
Kat finds a sponge under the sink of her new house that's actually a monster that causes and feeds on bad luck.
When Kat, Daniel, and Daniel's friend Carlos give away the sponge, they find out from Carlos that the sponge is called a Grool and that anyone who has it and gets rid of it, will die... Friends, Greg Banks, Doug "Bird", Michael and Sherri Walker, find a camera that predicts and causes misfortune on the subject it photographs.
Sue and Eddie are then sent back in time to the Middle Ages where a man named Morgred reveals that the siblings are really a missing prince and princess whom the executioner, under the king's orders, wanted dead.
Grady tries to prove that Vandal (the dog) is not responsible, but is shocked to find out that a real werewolf may be on the loose.
Part 1: Skipper Matthews finds out his favorite comic book villain, the Masked Mutant, is real after discovering his lair.
Part 2: Skipper Matthews fears he is losing his grip on reality after a visit through the Masked Mutant's lair and discovers that his new best friend is not who she seems.
Tim Swanson steals the bag of tricks from his favorite magician Amaz-O and finds himself unable to control the magic.
Gretchen Hughes and Clark Boretski stay at their grandparents' house in the middle of a swamp that has a seemingly invincible monster locked in a room.
After being taken to the O'Dells family, who owns a collection of ventriloquist dummies, Slappy is brought back to life and plans to test out Zane, a cousin of Trina and Daniel.
Erin Wright and her friend Marty are trapped in an amusement park based on a horror movie series.
Part 1: Visiting his aunt and uncle in rural Wolf Creek, budding photographer, Alex Blackwell, discovers a secret about the werewolves that live in the woods.
Becca Thompson and Benji Connor, on a field trip in the woods, find out why their new science teacher loves snakes so much.
Soon the mutants are cured while Ritter (having been turned into a gill fin man) is put on display at an aquarium.