Sergeant Bob Mackay of the Canadian Scottish about whom the story rotates and from whom we get the radiating message of "Carry on," is played by the Drury lane star Hugh Buckler a fine British artist with a long and distinguished career on the stage. His rendering of the part of the Sergeant is easily his finest performance on the screen. Bert Cann the head Camera man, who has, with his staff, been responsible for the very refined and beautiful photography in this picture, is an artist and Camera man of world-wide experience and repute. In "Carry on, Sergeant!' he has had opportunities of lighting, composition and quality, of an unusual character and he has made full use of them.