It all starts here! Power Pack’s biggest adventure ever begins, as they desperately search for the only person who can save the life of their grandmother – THE MIGHTY THOR! But first, they’re going to need to get to Asgard, and that means joining forces with Frog Thor...And THE PET AVENGERS! An epic tale that starts with a book of myths and ends with the destruction of the entire world, this is a journey into mystery that will leave Power Pack changed – forever!