Jock Mahoney's character.....
....is listed in the end credits as Harold. Somehow or other it became Alan, as that is the name Margaret Hathaway was calling him throughout the movie. ??????
shareHe is also referred to as "Commander Allan Roberts" (though it sounded more like Allan Rogers) by Capt. Burnham during the briefing in the beginning of the movie as well as other characters calling him Allan later on in the film.
share