This propaganda film pits a British-born, German-educated, chemical engineer (Stevnson - Robert Donat) who speaks Rumanian, German and Russian fluently against Nazis in Eastern Europe. Captain Stevenson becomes an Iron Guard named Tartu (the real Tartu is dead) and heads off, with minimal briefing and no espionage experience, to upset a Nazi plot. Stevenson seeks to infiltrate a German chemical weapons plant but needs help from the local resistance to succeed. But how, posing as a Nazi, can he get the underground to trust him?

Robert Donat is great. This is an imaginative WWII spy story with a couple of surprises. I think George Lucas must have seen it - look at the chase through the gas factory.

This version has a running time of 1h30mn, compared with an official running time of 1h43mn for the US version per IMDB (1h51mn for the UK cut).
There is another complete upload on the archive in the MPEG-2 format.