The Swarm
Season 3, Episode 17 (53)
Vital statistics
Air date Unaired
Written by Illyriarocks
Directed by Illyriarocks
Episode guide
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Nova Day The House of Zod
The Swarm is the 17th episode of Supergirl Season 3 and the 53rd episode overall.


PART 3 OF 8: ALEX TAKES COMMAND OF EARTH'S DEFENSE- When J'onn is incapacitated, Alex steps up as interim director of the DEO when Brainiac attacks Earth, ultimately learning the hard way that the Phantom Zone still exists. On New Krypton, Lesla-Lar works to save the lives of Dru-Zod, Kal, and Karen while Kara and Astra pursue Ral-Dar.


Main CastEdit

Special Guest StarsEdit

Recurring CastEdit



  • Antagonists: Brainiac, Sam Lane, Lex Luthor
  • This episode is Alex-centric.
  • This episode is concurrent with Nova Day and The House of Zod. It occurs during the afternoon of June 24, 2020.
  • This episode marks the final appearance of Maggie Danvers.
  • Krull was last seen in Fight or Flight.
  • This episode is notable for featuring nearly every significant living character that has appeared on the show.



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