They strongly resembled their counterparts except that they were fainter in color and had antennae on their heads.
They have the same way of talking as the real trio, but have less intelligence and act more like robots.
Scooby-Doo and Scrappy-Doo (second series)
They were created by an alien scheming to terrorize the Earth and destroy the real gang.
The Scrappy clone attempted to attack Shaggy and Scooby, but missed making a hole in the wall. He tried to announce their take-over of the Earth on the TV show That's Impossible, but the audience thought it was part of the show. Scooby grabbed the clone and locked him in the film vault then puts a cabinet to cover the hole he made. The Shaggy clone told him to put it back, which he does and he and the Scooby clone went onstage and also were mistaken as part of the show and got attacked by a karate-performing plant.
Scrappy and Shaggy find the Scrappy clone while Scooby runs into the rest. The alien sick of their bumbling ordered them to follow him to the TV set, but Scrappy used rolls of film that tangled them up and them and their masterr got flattened by a grand piano for another act, giving up the malfunctioning clones and the alien left to conquer another world.