In 1947, Warner Bros. brought in Marlon Brando for a screen test—his test was for an early script based on the novel, Rebel Without A Cause (1944).
That initial Warner’s Rebel script bore no resemblance to the film that the studio eventually produced in 1955.
What surprises me is that Brando was just 5′ 10″ tall and at 23 weighed 170 pounds—on screen he always seemed much larger. I suppose that’s part of celebrity, fine acting, and star-power: seeming larger than life.