Question: "Medusa" is the eighth episode of the second season from The CW television series "Supergirl", which aired on which date, the episode features a minor tie-in with the Arrowverse crossover event "Invasion!"?
Sentence (from "Medusa (Supergirl)"): "Medusa" is the eighth episode of the second season from The CW television series "Supergirl", which aired on November 21, 2016.
Relevant evidence: Yes