If Dr. Andrew Cook looks familiar to you (if not, mentally add little round spectacles ;) ) that's because he is played by actor Brandon Douglas, who originally appeared earlier in the season, in episode 16, "The Iceman Cometh" as Randolph Cummings, the con man wanted for fraud over the "Cummings Home Refrigeration Box".
Introduces the character Dr Andrew Cook.
Alley Mills playing Dr Mike's sister Marjorie, was married to Loren, Orson Bean, in real life from 1993 until his death in 2020.