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"Nightmare in National City" is the sixteenth episode of the sixth season of Supergirl, and the one-hundred-twenty-second episode overall. It aired on October 19, 2021.



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Special guest starring

Guest starring






  • The Lexosuit seemed to create an A.I. based off of Nyxly's own mind.
  • The Superfriends generating a dome around half of National City in order to trap the Nightmare monster is similar to the Stephen King novel Under the Dome, and the 2013 TV series of the same name, which is loosely based on the book (with the dome having trapped people within Chester's Mill; coming down precisely at the town's borders). Similar to the King novel, the dome is shown cutting a vehicle in half, with the unspoken implication that collateral damage involving humans and animals is possible.
  • Andrea references the March 2021 Oprah Winfrey interview with "the Royals" (Harry and Meghan). This is a rare direct reference to a very recent real-world event in an Arrowverse episode produced during the pandemic era.
  • The Dream Totem being located in the Dream Realm contradicts what Mxyzptlk and Nyxly said about each world in Earth-Prime's universe having seven AllStone Totems, unless each world has its own Dream Realm.
    • Though in Vertigo's The Sandman, different rooms represent different people's dreams. It is then possible one room could have contained the Dream Totem for Earth-Prime and is then specific to that Earth.
  • Of the AllStone Totems, Courage, Hope, Truth, Humanity and Love are psychological aspects; proven with the chaos caused by the Courage, Humanity and Hope Totems already caused. So the Dream Totem, along with the Destiny Totem are the most dangerous by default. (Dreams allow the dreamer to create whatever they wish. Plus Nia has used dream energy to create temporary constructs.)
    • This makes them similar to the Infinity Stones from Marvel Comics. With the first five Totems being counterparts to Soul and Mind; the Dream Totem counterpart to Reality and Power; and the Destiny Totem counterpart to Time and Space.


  • In the official press release for the episode, Maeve Nal's first name was misspelt as "Mauve".