|This character exists primarily within the Adventures of Sonic the Hedgehog continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Brandon Lawrence Rex (a.k.a. Dr. Qwark, Brandon Qwark, Qwark Rex, Brandon Qwark Rex and Dr. Qwark, Ph.D., P.D.S., C.E.G.) is a brilliant professor and a mad scientist with the rivalry of Dr. Robotnik that had a little lab accident that turned him into half a duck.
He has spiky red hair, sharp teeth, white skin and gray eyes. He wears a gray suit, green goggles, gloves, boots and a belt with a yellow piece in the middle. Dr. Robotnik calls him "Quack", but Dr. Qwark replies and declares he's "Qwark". He's just another CEG (Crazy Evil Genius) trying to take over Mobius. His greatest invention is D.U.F.U.S. - a super intelligent robot who can morph into just about anything. For a time, Qwark and Robotnik duked it out until Qwark cracked. He ended up flying south for the winter - literally.
Dr. Qwark is voiced by Terry Klassen.