Supergirl is called into action when remnants of Cadmus attempt to assassinate pro-alien leaders, but their endgame turns out to be more sinister than she thinks.
Did You Know?
's first appearance as a series regular, after recurring in season three. See more
The stock footage of "Madrid" actually shows Buda Castle in Budapest, Hungary. See more
You doing okay?
Yeah. And thanks for being here. I know you pick your battles now.
Well, it seemed like a good battle to pick.