He looked identical to Scooby except that he wore a yellow collar instead of a blue one.
He seemed to be just like Scooby-Doo, only more intelligent and helpful. This was a programmed act, because he was actually a robot with his only loyalty to the Science Ghoul. Even his speech impediment, with "z" sounds put in front of words, was an act.
Scooby-Doo! (DC Comics)
The gang came close to capturing the Science Ghoul, but all of them were slowed down by sticky foam, and only Scooby was free to chase the Ghoul. When he got close the Ghoul triggered a bright flash and suddenly there were two Scoobys in the room. Shaggy Rogers dubbed the second "Scooby-Two" and suggested he join the gang. Scooby-Two seemed very friendly and helpful, but he was reporting to the Ghoul and keeping him one step ahead. Finally, he was caught spying by Scooby. In the fight that followed, Fred Jones turned a hose on them and the water shorted out the robot.
- In many ways Scooby-Two is similar to Robopup, though he was more cleverly made to appear more like a real dog.
- The cover illustration shows Scooby-Two with a different dog-tag, with the letters "S2" instead of "SD" and the coloring is reversed -- it has blue letters on a yellow field instead of yellow on blue. The ring holding the tag to the collar is blue. In the story, the lettering was identical with Scooby's, and only the coloring was reversed; both had yellow rings on their tags. The cover version is probably just artistic license.