Hawkeye and Trapper move a North Korean P.O.W. patient into the Swamp, rather than have him shipped out early. They discover that the P.O.W. has a rare blood type. Since Frank has the same blood type, they furtively steal some of Frank's blood in the night. However when the patient develops hepatitis, they suspect Frank is the carrier, and have to keep him away from Margaret and patients.
This is the last episode in which Spearchucker Jones appeared.
This episode contains examples of:
- AB Negative: While it's never actually specified what blood type Frank and the prisoner are, it's implied to be AB-, although it also could be O-, which, unlike AB-, can only take transfusions of O-.
- Chuck Cunningham Syndrome: Spearchucker Jones disappears with no explanation after this episode. Fox had him removed because they didn't have any evidence there were black doctors, but in actuality, it was a double case of research failure, since Spearchucker Jones was based on a black doctor Robert Hooker heard about at the 8055, but had been sent home only a month before Hooker's arrival in Korea.
- The Other Darrin: This is the only other episode where Karen Philipp plays Lt. Dish.