Terry Dexter hankers for the happier times with his beloved grandmother Mary, riding rollercoasters in her theme park. Unfortunately, Mary is gone and the park has fallen into disrepair. Creditors are knocking at the door and if Terry misses one more payment, the park will have to close forever. As he reminisces about the past, Terry unwittingly unlocks a doorway to a parallel world ruled by Princess Dawn, whose kingdom has been cursed with eternal gloom by a wicked wizard called The Grump.
I love this!