When her mother leaves town to visit a sick relative, Margaret's concern for her father grows. She does not know what he is working on in the basement and cannot figure out why his behavior has changed.
After Larry and his friends use the contents of an expired bottle of instant tan, strange things start to happen: Larry begins to grow hair on unusual parts of his body, and his friends start to disappear.
When her family moves into a new house, Kat finds a sponge which appears to be alive, but no-one will believe her. After the discovery, the family is besieged by bad luck, and Kat is convinced the sponge is behind it.
Greg and his friends break into an old warehouse, where they find an unusual camera. However, the photographs Greg takes with it seem to predict disaster, and he becomes convinced the camera is cursed.
While on his way to an orthodontist appointment, comic book enthusiast Skipper spots a building which resembles his favorite villain's headquarters. However, when he and new friend, Libby, venture inside, they have no idea what awaits them.
After Libby decides to go home, Skipper leaves the strange building as well. However, when he receives a comic book that seems to depict him saving his hero, he decides to go back and solve the mystery once and for all.
Best friends Duane and Stephanie regularly attend the tour of Hill House, a local haunted house, pulling pranks on unsuspecting visitors. However, when they decide to look for the head of a ghost, they get more than they bargained for.
Todd is obsessed with worms. He is planning to do his science project on them, along with playing a prank on his sister. However, it soon becomes apparent that Todd's wriggly friends may be turning against him.
Hat and Eddie despise Courtney, the teacher's pet, and constantly try to scare her. They eventually decide to trick her into thinking the local "mud monster" legend is true, but, in the process, get much more than they bargained for.
While visiting their elderly cousins in a remote coastal town, brother and sister Jerry and Terri are told about an apparently haunted cave by two mysterious teenagers. However, when they explore the cave, the mystery deepens.
When Drew's friends, Shane and Shana, pay her a visit, they offer to help her scare local bullies, Tabitha and Lee on Halloween. However, the evening turns terrifying when two jack-o'-lantern headed ghouls attack.
Evan's visit to his great aunt Katherine's house turns eventful when he finds a jar marked "Monster Blood". He and his new friend, Andy, decide to try it out, but are horrified to find that it is growing.