After visiting his favorite prehistoric pet store for months, a young boy decides to try and spend the night. Luckily, the pet store decides to have a sleepover event. There, the kids can come and learn about all the prehistoric creatures that live in the store. However, an unfortunate turn of events occurs. One of the creatures escapes from containment and starts terrorizing the store. While everyone flees in a panic, the young boy is left behind. Despite his fears, he decides to confront the terrifying monster. As it turns out, the monster just wanted to join in on the fun. After a long night of playing around, the monster and boy decide to snuggle up for the night.