Previously, 3D Realms did sell Duke Nukem to Gearbox, who finished development on Duke Nukem Forever and released the game as expected.Īfter this had happened 3D Realms was then purchased by the Danish developer Interceptor, who teased a game called Duke Nukem Mass Destruction. Gearbox, the maker of Borderlands, had been embroiled in a lawsuit with 3D Realms and Interceptor Entertainment over the Duke Nukem intellectual property.