McMurphy and K.C. are kidnapped by the Viet Cong and taken underground into a warren of tunnels, where their captors expect McMurphy to operate on their wounded leader.

Dodger is left with an Amerasian baby that is supposedly his son; McMurphy makes a poor patient when she comes down with dysentery; and Holly badgers everyone into answering the letters sent by seventh-graders from Colorado.

Dr. Richard worries over a craniotomy that has permanently altered a patient's mental capacity; Lila faces an inspection that will determine if she gets a key promotion; Sarge Pepper asks for some advice about courting Lila and K.C. finds herself in a very awkward position when a senior officer goes AWOL on her permanently.

China Beach celebrates a soggy Independence Day with Boonie and Holly trying to keep everyone's spirits up, McMurphy dealing with a love struck private as she tries to sort out her feelings for Dr. Bernard, Lila and the Sarge discussing the future and Beckett and K.C. quarreling over registering the dead to vote.

K.C. avoids dealing with unpleasant memories of her father stirred up by a trunk of his belongings; Dr. Richard faces his ex-wife's remarriage with a ""black wedding""; Beckett ends his relationship with Mai; and McMurphy learns more about Dr. Bernard's life.

Holly is shaken when it appears that Hang is connected to the VC and has been using their friendship to gain information; Frankie is seriously injured by a booby trap; and McMurphy aids Dr. Bernard at a civilian clinic.

Dodger and Hyers square off after a battlefield incident; McMurphy spends an uncomfortable evening with Dr. Bernard's sophisticated civilian friends; and Boonie gets a surprise from the sexy Asian singer all the men in camp are longing for.

The wounded Cambodian POW befriended by McMurphy is taken away by the South Vietnamese for interrogation as the photographer Cat pursues the story of his defection and a new commander arrives to take over the base, leaving Lila and K.C. unsure of their positions.

McMurphy finds herself caught up in a triangle affair with Dr. Bernard and Vinnie; Holly tells Boonie how she feels about him; and Lila copes with the disappointment of losing command of China Beach to Otis.