Conqueror Duck was one of Walt Fleischman's cartoon creations. When the Ghostbusters arrived in the cartoon world, the first cartoon they met was Conqueror Duck. He was dispatched by Winchester Wolf to take care of the Ghostbusters with his cartoon powers. Egon and Dopey utilized cartoon logic to rescue the others.
- He is a reference to Disney character Donald Duck. He is also dressed as a Viking.
- On page three of Ghostbusters Issue #5, Conqueror Duck makes a non-canon cameo as a costumed employee of Fantastic Land.