The Ghost & Mrs. Muir - Season 1 - Eps 24: The Medicine Ball
Carolyn comes down with a bug, and Captain Gregg, dissatisfied with the doctor, concocts his own remedy which sends Mrs. Muir back to the mid-1800's where she is the "ghost" and the very much alive Captain is the only one who can see her.
About The Ghost & Mrs. Muir

Title: The Ghost & Mrs. Muir
First Air Date: 1968-09-21
Last Air Date: 1970-03-13
Status: Ended
Rating: 6.4/10 (from 16 votes)
Language: EN
Seasons: 2
Total Episodes: 50
Network: ABC NBC
Genres: Sci-Fi & Fantasy, Comedy
Production Companies: Unknown
Synopsis
Derived from the 1947 movie with the same name, a house is haunted by a deceased sea captain who wreaks havoc with the new tenants who were not advised of his existence.
Cast

Edward Mulhare
Captain Daniel Gregg

Hope Lange
Carolyn Muir

Charles Nelson Reilly
Claymore Gregg

Reta Shaw