Hogan goes to the hospital to get information from a wounded contact.
Coming up with a fake secret device, the gonculator, Klink brings to Stalag 13 the electronics expert who wants to defect.
Newkirk poses as a traitor to send information via a propaganda radio broadcast.
Hogan convinces Klink that he is a great artist so that he can make a rendezvous in an art gallery.
Hogan has to save Klink when his account books at Stalag 13 aren't quite correct.
