"Mon-El taught us everything we know. From Aristotle, Shakespeare, Bon Jovi."
"But we have some gaps. And unfortunately, even if we know the end result, we don't necessarily know how it happens.

Imra Ardeen and Mon-El[src]

This article contains plot details about an upcoming episode.

"The American Alien"[3] is the upcoming first episode of the fourth season of Supergirl, and the sixty-sixth episode overall. It will air on October 14, 2018[1].


  1. Shows A-Z - supergirl on cw - The Futon Critic
  2. Supergirl - Season 4 Premiere Title Revealed - Spoiler TV