Lo imposible le sucede al Charles snob cuando comparte una experiencia emocional con Klinger, quien descubre que una enfermera estadounidense, Debbie, lo encuentra atractivo a él y a su atuendo extraño, mientras Charles sucumbe a los encantos exóticos de una niña coreana, llamada Sooni, a quien conoce en el bar de Rosie.

Colonel Potter turns crotchety when he catches the mumps, and his condition is worsened when Winchester gets the same disease and has to be quarantined with him. A temporary replacement surgeon, Newsome, is quickly brought into the 4077th and seems to be a gem in terms of both personality and ability.

B.J. finds himself attracted to a famous war correspondent, Aggie O'Shea, who has fallen in love with him.

Hawkeye, B.J., and Margaret try to save the life of a critically injured solider so that his family won't think of Christmas as the day that their father died. Meanwhile, Winchester fulfills a family Christmas tradition but has trouble maintaining the anonymity required to keep it a truly charitable act. Even Klinger lends a hand.

The 4077th faces a sleepless night as Charles's snoring keeps B.J. and Hawkeye from counting sheep. Meanwhile, Colonel Potter discovers that his son-in-law, Bob Wilson, has had an affair.