Qwark first appears in a massive tank-like machine which grapples with Robotnik's own tank using magnetic rays. They fight over Sonic and Tails as they both try to capture the heroes, but lose their quarry and wreck each other's machines. Qwark introduces himself to Robotnik and proclaims his intentions to conquer Mobius, but Robotnik states that he's going to take over first and starts calling his new rival "Qwack", referring to his duck-like feet. Qwark proposes a contest between the two mad scientists: whoever captures Sonic first shall lay claim to Mobius. Robotnik agrees and the two begin scheming and plotting against each other as they try to hunt down Sonic and Tails. Their attempts all fail until Qwark's shape-shifting robot D.U.F.U.S. suggests that they combine forces. The two sci