Other names to keep in mind – especially if you're familiar with the comics: Sam Witwer as anti-alien activist Agent Liberty; Rhona Mitra as Mercy Graves, Lex Luthor's one-time bodyguard and also a "human first" supporter; and Robert Baker as Mercy's brother and enforcer, Otis.
https://www.youtube.com/watch?v=Jw30raSbrhE
Season three saw Supergirl stop Reign and the other Worldkillers' threat[...]
