Professor Sludge is a scientist of the enemy. He is addicted to experiments, even if it means causing a harmless person to die. Professor Sludge is the reason why Dust became evil, because of the injection he planted in him. Professor Sludge pilots a hovering pod armed with lazers and sheild in Bunny kill 3. He is seen again in Bunny kill 5 to help Smoke in making a chemical.