 Box and Thomas had a major box office hit in "Doctor in the House" (1954) which turned Dirk Bogarde into a star.Bogarde was ideal casting for "Campbell's Kingdom" and he became attached to the project.The film was almost made after "Doctor at Sea" when there was a financial crisis in the British film industry and Rank requested Box, Thomas and Bogarde make a third "Doctor" film, "Doctor at Large", instead.