Follow That Witch (Part 1)

 is the thirtieth episode of the second season, and the sixty-sixth episode of the Bewitched series. The episode was completed by February 17, 1966.

Plot
A private detective named Charlie Leach is hired by an employee of a potential McMann & Tate client to learn more about Darrin's home life. Leach catches Samantha using her powers. When his employers disbelieve then fire him, Leach decides to blackmail Samantha.

Casting

 * Due to Alice Pearce's illness at the time of filming (she died a few weeks later), Mary Grace Canfield was brought in as a "Gladys surrogate", making her first appearance as Harriet Kravitz.
 * Agnes Moorehead did not appear and received credit only.

Cast

 * Elizabeth Montgomery as Samantha Stephens
 * Dick York as Darrin Stephens
 * Mary Grace Canfield as Harriet Kravitz
 * Jack Collins as Mr. Robbins
 * Judy Pace as Miss Perkins
 * Steve Franken as George Barkley
 * Robert Strauss as Charlie Leach
 * Virginia Martin as Charmaine Leach
 * Julie and Tamar Young as Tabatha Stephens (uncredited)

Source

 * Bewitched, Season Two episodes on Wikipedia. Retrieved on November 24, 2019.