During Samantha's temporary absence, her lookalike cousin, Serena, is left to her own devices in the Stephens household. Failing to recognize Sam's mother-in-law, Phyllis Stephens (Mabel Albertson), Serena takes umbrage at an offhand remark and transforms the old lady into a cat. The crisis intensifies when the "feline" Mrs. Stephens is adopted by cat fancier Miss Parsons (Ruth McDevitt). Written by Peggy Chantler Dick and Douglas M. Dick, "Mrs. Stephens, Where Are You?" originally aired on February 13, 1969. ~ Hal Erickson, Rovi