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Lucy's Mother-In-Law is the eighth episode of the fourth season of I Love Lucy, and the one hundred fifth episode overall.
Lucille Ball (Lucy Ricardo),
Desi Arnaz (Ricky Ricardo)
Vivian Vance (Ethel Mertz),
William Frawley (Fred Mertz)
Pilar Arcos (Party Guest),
Virginia Barbour (Assistant to Professor),
Fortunio Bonanova (Professor Bonanova),
Mary Emery (Ricky's Mother),
Rodolfo Hoyos, Jr. (Party Guest)
Behind the Scenes
Allusions and References