“Supergirl + The Flash” crossover episode synopsis revealed

We recently got a look at the poster image promoting the Supergirl / The Flash crossover episode entitled Worlds Finest. Now check out the synopsis:

“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, ET/PT) on the CBS Television Network. Grant Gustin crosses over as The Flash.

CHEAT TWEET: It’s 2 heroes vs 2 villains in National City when @grantgust guest stars! #SupergirlXTheFlash 3/28 8pm on #CBS! http://bit.ly/1Tt3g4E

REGULAR CAST:
Melissa Benoist
(Kara Danvers/Supergirl)

Calista Flockhart
(Cat Grant)

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Chyler Leigh
(Alex Danvers)

Mehcad Brooks
(James Olsen)

David Harewood
(Hank Henshaw/J’onn J’onzz)

Jeremy Jordan
(Winslow “Winn” Schott)

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RECURRING CAST:
Jenna Dewan-Tatum
(Lucy Lane)

Chris Vance
(Non)

Italia Ricci
(Siobhan Smythe)

Brit Morgan
(Leslie Willis/Livewire)

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Christopher Showerman
(Tor)

Jay Jackson
(News Anchor)

Dan Warner
(Fire Captain)

GUEST CAST:
Grant Gustin
(The Flash/Barry Allen)

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Jamie Kaler
(Pundit #1)

Samantha Harris
(Pundit #2)

Zarek King
(Young Boy)

Sarah Robson
(Dr. Amelia Hamilton)

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Harriet Sansom Harris
(Sinead)

Dawn Greenidge
(Pedestrian Woman)

STORY BY: Greg Berlanti

TELEPLAY BY: Andrew Kreisberg and Michael Grassi

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BASED ON: The Characters Appearing in the DC Comics

DIRECTED BY: Nick Gomez

Supergirl / The Flash crossover episode “Worlds Finest” is slated for to air Monday, March 28 at 8/7c on CBS!