Robotnik's Rival

is the 36 episode of Adventures of Sonic the Hedgehog.

Plot
Robotnik and a rival scientist named Dr. Quark try to cooperate in capturing Sonic. At first they are successful, but due to Scratch and Grounder's incompetence, Sonic and Tails get away. A stream of attempts from Sonic to make the 2 doctors hate each other (along with Scratch and Grounder tricking Quark's super-intelligent robot, "DOOFUS", into turning against its master) eventually results in their failure.

Sonic Sez
Robotnik and Doctor Quark decides to have a race. and Sonic explain that is bad to cheat

Trivia
Sonic and Tails makes the salute to hitler in this episode, except that it says "Hail Quack"