Alan Ladd appears in his first credited appearance in this movie. I'm sure he was in at least one or two serials earlier without credit. As the box notes state, his "good looks and onscreen intensity enabled him to quickly gain popularity." All true; but listen to the terrible German accent he uses. Fortunately, he stayed away from accents and went on to better things. The movie as a whole had a good idea but it was just too weak and, I guess, we knew not enough about Nazi Germany when then film was relased in 1939. After all, the hero escapes a German concentration camp by running away and jumping on the back of a hay wagon driven by his friends through it? Oh, well...