This had been previously mentioned in The Original Series episodes "Balance of Terror", "All Our Yesterdays" and "The Savage Curtain" as well as The Next Generation episode "Gambit".
Michael Westmore developed a new appearance for the Romulans in this episode, being required to take into account the concepts introduced for them in the original series episodes "Balance of Terror" and "The Enterprise Incident".
Of course, there were many horrific episodes, years of terror and counter-terror, but as a whole, we lived a life that was often quite interesting and funny.
6 Episodes of night terror in adults are similar to the ones described in children, and seem to occur in adults with a history of psychopathology.
The episode "Balance of Terror," for instance, meditated on the futility of the Cold War.
The first day's filming coincided with the airing of the episode "Balance of Terror", and Daniels allowed the cast and crew to go home early so that they could watch it.
Another controversial scene in the episode "Tales of Terror" saw the Meldrews visit Ronnie and Mildred on the understanding that Mildred had gone upstairs during a game of Happy Families and not returned; Ronnie then shows her feet hanging outside of the window, revealing that she has committed suicide.
Researchers considered episodes of sleep terrors to be distinct from nightmares.
Small excerpts have also been recovered on 8mm cine film taken by a fan in Australia, who filmed certain scenes directly from a television screen during repeat showings of various episodes (including some that are intact); the clips from missing episodes range from Episode 4 of The Reign of Terror to Episode 2 of The Faceless Ones.
President Obama called the episode an "act of terror".
