Clamhead has got to be decended from Shaggy
They look the same, and have the same last name. And this takes place 100 years after Scooby Doo (2076).
As I said once also, Tinker from Speed Buggy has got to be related too.
Damn Smurfs messing with the space time continuum, spreading the Rogers family all to pieces, Poor Jabber must have been affected too when he somehow made it to the then present for the Laff-a-lympics, Space Race and Treasure Hunt.
I refuse to argue on IMDB until the general populous actually uses their brains