It's challenge time again with Boomerang Let's Create and for this one we want you to design your very own monster that would send Scooby-Doo running for a place to hide.
Will your monster have lots of eyes so it can keep a close watch on Scooby, big scary claws to catch him with or will it have a mouthful of spiky teeth to scare the gang when it lets out a huge howl? Whether it's small and spooky or massive and menacing, make sure your monster is bright and colourful - and you can even give it a creepy name.
Once you've finished your picture send it to us and it could appear in the Boomerang Let's Create gallery.
Here's a picture of a time-travelling otomutles sent in by Millie aged 10 to give you an idea of how your monster might look.
Here's a picture of Scooby looking scared before he's even seen your spooky monsters! Drawn by Leonardo aged 6.