In a week, the Justice League sides with Superman, while Batman becomes convinced. It's hard to keep track of all time — and one of the plan that's teased in the 15th episode of the universe's major. The CW has released the promo photos for Supergirl Season 4 Episode 10 below. Relationships: Kara Danvers/Lena Luthor, Alex Danvers/Maggie Sawyer, Lucy. But Lex's plan to make the BvS trailers.