The Parallel Universe: Teen Wolf/Maze Runner
In the woods, in the dark, something is stirring.
A monster not of this world.
It can not be destroyed in the pack's world and if it is there to long it will mess with the balance of their world and course destruction in its wake, they must get it back, no matter the cost....
They don't know anything about this creature a part from its name.
Its called a Griever.