A pair of siblings make the most of a school snow day, while trying to avoid their nemesis, the Snowplowman.

Ryder and the pups are called to Adventure City to stop Mayor Humdinger from turning the bustling metropolis into a state of chaos.

Three nerdy friends and the school bully must get themselves thrown into detention to find the entrance to a labyrinth of trap-laden tunnels protecting the fabled hidden lab of Alexander…