Commando Comic #4441 'The Stranger From The Sea' (2011)
 
When the crew of a German MkVII U-boat picked up a body floating in the icy North Sea they were amazed to find that somehow the man was still alive.
 
When the stranger came round, though, the mystery man had no memory of who he was or how he'd got there. It seemed he could understand both German and English, but whose side was he on…?