Guest star Lloyd Bochner and series regular Richard Kiel had thirteen years earlier co-starred in the classic episode of The Twilight Zone (1959) titled "To Serve Man."
The episode title as shown on-screen included an underline of the word "Who?".
Guest star Rosemary Forsyth had memorably co-starred with Doug McClure in the classic western film Shenandoah (1965). McClure and Forsyth had also headlined the mad-for-TV movie The Death of Me Yet (1971).