Doctor Brandon Quark is a minor antagonist that appears in the Adventures of Sonic the Hedgehog television series. He is a brilliant professor and a mad scientist rival of Dr. Robotnik who had a little lab accident that turned him into half a duck.
Quark 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. Quark was 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, Quark and Robotnik duked it out until Quark cracked. He ended up flying south for the winter - literally.
Dr. Quark hates whenever Dr. Robotnik calls him "Quack", prompting him to declare that his name is "Quark".