Calvin and friends have found a new ally in Fogu. With Fogu’s help, there is a greater chance at capturing the evil Wardens, Tera and Kalo.

Tera and Kalo have been trouble from the start. Now, they have released all prisoners from The Halebury Prison, causing more chaos in the Overworld.

With the potential alliance between the two Wardens, and Professor Murray, Calvin and his friends have to be extra careful with their next steps. After all, they were facing not only the terrifying Wardens but also an intelligent and mischievous professor who was capable of the most despicable things!