On March 28th, the CW’s “The Flash” comes to CBS’s “Supergirl” for a one-off guest shot. 

The episode is entitled “Worlds Finest” and finds Barry Allen traversing the multiverse and ending up on Supergirl’s Earth.  As it is, both shows don’t exist in the same reality, which allows both networks to not have to keep any kind of continuity between shows.

A new episode synopsis and poster have been released.

“Kara gains a new ally when the lightning-fast superhero The Flash 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.”

For behind the scenes pics from this episode, click HERE!

I have no doubt it’s going to be a fun episode.