Manfredi and Johnson? Nobody knows if they really did use to work with Skipper or just a part of his imagination. He repeatedly brings up the many different ways they've died to get a point across. And from what I can tell, the other three know about the two, but only from Skipper's stories. The makers of PoM say they are based off two characters from the movie "Stalag 17" who died in the beginning. Only 11 episodes are left in the series and an upcoming PoM movie, so there is a chance we will find out who they are in the future.

Ok many thanks dawg :)

@Private1sCut3: I got info that The Penguin Who Loved me is an episode that will tell about Denmark, and Manfreedi, and Johnson. (Find the forum that's called Epic sadness involving P.O.M. in the Fans of PoM club)

@CuteCuddly: Really?!? =D I'm even more excited now to see it!!!