Supergirl/The Flash Crossover – First Footage and Stills From Episode 18, “Worlds Finest”

"Worlds Finest" -- Kara (Melissa Benoist, left) gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, right) 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. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.

“Worlds Finest” — Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.

Supergirl comes face to face with the Worlds Fastest Man when Grant Gustin guest stars as the Flash in episode 18, titled “World’s Finest.” 

Watch The Flash and Supergirl race in new teaser:

“Worlds Finest” — Kara (Melissa Benoist, right) gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, left) 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara (Melissa Benoist, left) gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, right) 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara (Melissa Benoist, pictured) 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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 (Italia Ricci, pictured), 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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 (Italia Ricci, right), and Livewire (Brit Morgan, left) 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. Also pictured: Calista Flockhart (center) Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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 (Italia Ricci, left), and Livewire (Brit Morgan, right) 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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 (Italia Ricci, pictured), 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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 (Brit Morgan, pictured) 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Jenna Dewan-Tatum, Melissa Benoist and Grant Gustin Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara (Melissa Benoist, left) gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, right) suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire (Brit Morgan, center) 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, pictured) 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. Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Jenna Dewan-Tatum Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Jenna Dewan-Tatum, Melissa Benoist, Grant Gustin and Jeremy Jordan, Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Calista Flockhart Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Jeremy Jordan, Grant Gustin, Mehcad Brooks and Melissa Benoist Photo: Robert Voets/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara (Melissa Benoist, left) gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, right) 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. Also pictured: Mehcad Brooks (center) Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, pictured) 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. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara (Melissa Benoist, left) gains a new ally when the lightning-fast superhero The Flash (Grant Gustin, right) 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. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.
“Worlds Finest” — Kara (Melissa Benoist) 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.

Official Synopsis:

Grant Gustin Crosses Over as “The Flash”

“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.

Stars: Melissa Benoist as Kara Danvers/Supergirl, Calista Flockhart as Cat Grant, Chyler Leigh as Alex Danvers, Mehcad Brooks as James Olsen, David Harewood as Hank Henshaw and Jeremy Jordan as Winslow “Winn” Schott.

Recurring Cast: Jenna Dewan-Tatum as Lucy Lane, Chris Vance as Non, Italia Ricci as Siobhan Smythe, Brit Morgan as Leslie Willis/Livewire,  Christopher Showerman as Tor, Jay Jackson as News Anchor, Dan Warner as Fire Captain.

Guest stars: Grant Gustin as The Flash/Barry Allen, Jamie Kaler as Pundit #1, Samantha Harris as Pundit #2, Zarek King as Young Boy, Sarah Robson as Dr. Amelia Hamilton, Harriet Sansom Harris as Sinead, Dawn Greenidge as Pedestrian Woman.

Written by Andrew Kreisberg and Michael Grassi. Directed by Greg Berlanti.

‘Supergirl/The Flash Crossover’ episode airs Monday, March 28th at 8:00-9:00 PM, ET/PT.

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