"INSTA-GRO PET: Amaze your friends with a GIANT creature!"
Sam Waters is desperate to have a pet. Too bad his parents don't think he's responsible enough and will barely let him keep the weird Insta-Grow animal from the HorrorLand gift shop. To prove he's responsible, Sam takes an after-school job in a pet store that sells nothing but hamsters. To his horror, Sam soon finds that cute, little hamsters can become very UNCUTE monsters. Suddenly, Sam isn't fighting for a pet — he's fighting to survive! Could the souvenir he got in HorrorLand have anything to do with this?
Each eerie adventure of this series begins with a trip to the Chiller House, a gift shop only found in HorrorLand. Kids are invited to take a little horror home with them and given a souvenir and a miniature Horror. At home, the kids experience wild things with their "free" gift, while the glowing, menacing Horror keeps an eye on the fun. When it's time for their payment, the Horror takes them back to shopkeeper Jonathan Chiller.