The Supergirl/Flash Crossover Gets a Poster, a Plot and an Easter Egg

CBS has released a  poster and plot details for the much anticipated Supergirl/Flash crossover episode. The plot synopsis reads:

“Worlds Finest” – Kara gains a new ally when the lightning-fast superhero The Flash (Grant Gustin) suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM) on the CBS Television Network.

This confirms what we all pretty much suspected. Supergirl and the Flash live in different dimensions. It’s a great solution that explains why Supergirl never pops in to help the Flash, but still leaves the door open for occasional meetings between the two.

The  poster for the episode doesn’t give us much new information, but is a fun Easter Egg for comic book collectors with long memories. It recreates the classic cover of Superman #199 from 1967 drawn by industry legend Carmine Infantino,.

Click to enlarge.

“Worlds Finest” airs on Monday, March 28 on CBS.