Sine Qua Non
Season 9, Episode 11
Vital statistics
Air date Unaired
Written by Illyriarocks
Directed by Illyriarocks
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A Glimmer of Hope Never Know
Sine Qua Non is the 11th episode of Supergirl Season 9 and the 171st episode overall. It is the first part of the 3-part JANUS DIRECTIVE arc.


PART 1 OF 3: THE MISSION- James partners with Dawn to take down the Janus Directive, a cabal of interagency officials looking to usher in a new world order.

Main CastEdit

Recurring CastEdit



  • Antagonists: Lady Liberty, Sofia Falcone
  • Lucy does not appear in this episode.
  • Sine qua non is a Latin phrase referring to an essential action, condition, or ingredient.
  • This episode takes place on April 20, 2024.
  • This trilogy of episodes is James-centric.



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