Gustav and one of his former students, Arthur Bauer, find a rare herb and develop a formula called the quinidrine solution, which they hope will reverse the effects of a vampire's bite. When Arthur is kidnapped, Gustav allows himself to be captured by Lucard so that he can test the solution on himself and Arthur. But the formula doesn't work, because Max has confused it with his high protein energy drink and has consumed all the quinidrine. When the kids arrive to free Gustav, Max is able to fend off Lucard and his lieutenant, Klaus, by firing energy bolts at them through his fingers. They escape back to the house, where the kids quickly use their last remaining quinidrine leaf to mix up another batch of the solution for Gustav and Arthur. Gustav is saved, but Bauer chooses to reamin a vampire. He attacks Gustav, but doesn't know about the Cross of the Magyars, the house's protective talisman...which then destroys him.