GUESS WHO'S COMING TO DINNER? It’s Thanksgiving in Midvale, and Kara is fretting over her first holiday home in a while. With plenty to be thankful for, Supergirl has nothing to worry about, right? Wrong! In an attempt to patch things up with her father, Lena has invited Lex Luthor and his girlfriend, Mercy, home for the holidays. What machinations could Lexcorp have for the sleepy little town? Find out as heroes and villains sit down to break bread and perhaps bones.