Whilst a school excursion to an old city museum, end-of-school leavers and best friends, Michael Fleming and Sam Braden - along with their classmate Krystal Mack - sneak off from their tour group to explore the lower levels of the building. Unbeknownst to them at first, they are somehow left stranded in a parallel universe; a world similar but with vast difference to their own. Now together they must travel the multi-verse in an attempt to find their way home!