When Steve gets a new retainer it somehow allows him to hear the thoughts of dogs. But it turns out that man's best friend isn't so friendly after all.
When Marshall's dad loses his briefcase containing his latest invention, it could cost him more than just his job, since the briefcase was a gift from his wife.
It's Halloween and Marshall and Simon are stuck at home babysitting Simon's younger brother Harley. But the night isn't as boring as they expected, when Harley switches places with the mummy from the monster movie he's watching.
Marshall and Simon are surprised to find that instead of detention they get sent to have an eye test. But with his new glasses, Simon seems to have lost his sense of fun, and all he wants to do is study.
Melanie arrives in Eerie and both Marshall and his friend Devon fall for her. But when Devon is killed in an accident and his heart is transplanted into Melanie's body, she starts to act a lot like him.
Marshall discovers an old undelivered letter along with the ghost of its author, Tripp McConnell, who wants Marshall's help to finally deliver the letter to his childhood sweetheart.
Eerie doesn't have daylight savings time, but Marshall's determined not to miss out on the extra hour and sets his watch back anyway. Then everyone in Eerie disappears, except for some creepy garbage collectors and a strange milkman.
Professor Zirchon, renowned authority on the para-believable, announces that an extraterrestrial object he is tracking will land in Eerie. Marshall and Simon hope that they've finally found someone who might believe them.
Marshall decides to stay home while the rest of the town is out to celebrate the annual Tornado Day celebrations. But Old Bob is a tornado with a big ego and doesn't take kindly to Marshall's boycott.
When Marshall and Simon investigate an old haunted mill they discover that it's just a hoax, set up by a mysterious boy with gray hair. But then they uncover an old rusted gun and the ghost of Grungy Bill, Eerie's worst bank robber.
Marshall wins a lottery to select the next Harvest King, and must go into the woods to face the Eerie wolf. The only problem is that none of the previous 'winners' have ever returned.
Marshall and Simon witness a homeless man being attacked by a woman with a ray gun and decide to help him out. But things get really weird when they turn on the strange contraption the man was making.
Mr Teller joins the Loyal Order of Corn, and Marshall and Simon discover that the Order is building what appears to be a giant TV screen. But when Simon steps into the screen he gets transported to another planet.
As the World o' Stuff's new marketing campaign takes subliminal advertising to a new level, sleepwalking customers start buying everything in sight on credit. But they should have read the small print.
