Beau Bridges, Stacy Keach, Sidney Poitier, Jack Nicholson, and Donald Sutherland were considered for the lead role of David Sumner before Dustin Hoffman was cast. Hoffman agreed to do the film because he was intrigued by the character, a pacifist unaware of his feelings and potential for violence that were the same feelings he abhorred in society. Judy Geeson, Jacqueline Bisset, Diana Rigg, Helen Mirren, Carol White, Charlotte Rampling, and Hayley Mills were considered for the role of Amy before Susan George was finally selected. Hoffman disagreed with the casting, as he felt his character would never marry such a "Lolita-ish" kind of girl. Peckinpah insisted on George, a relatively unknown actress in the US at that time.