0021 - The Ring of Truth (1/26/1974)
Written by Henry Slesar. Directed by Himan Brown.
Cast: Agnes Moorehead; Mandel Kramer; Santos Ortega; Ian Martin; Dan Ocko.
CBSRMT Trivia: Agnes Moorehead only appeared in two Mystery Theater episodes before she died three months after this episode aired. Mandel Kramer plays a character with his last name in this episode.