Trapper John, M.D. - Season 4 Episode 1 Don't Rain on My Charade
Overview: When Melanie's mother comes for a surprise visit, Trapper learns that Melanie has kept their divorce a secret from her for the last six years. Gonzo suggests that a doctor should work as a nurse for a week to get a better idea of the problems they are having, and he gets volunteered for the job.