When the castle walls of Max and Finlay's den start crumbling away, little do the best mates know that everything is about to change... Trapped inside the wall is the ancient god Hercules and he needs the boys' help! The friends must complete a terrifying challenge every day for seven days and can choose only one of Hercules' amazing superpowers at a time to help them.

In the penultimate, exciting Superpowers adventure, Max and Finlay have to defeat a snarling three-headed dog! Will they choose the right superpower?