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SUPERGIRL GAINS A NEW ALLY WHEN THE LIGHTNING-FAST SUPERHERO THE FLASH HELPS HER BATTLE LIVEWIRE AND SILVER BANSHEE
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.
Grant Gustin (The Flash/Barry Allen), Jamie Kaler (Pundit #1), Samantha Harris (Pundit #2), Zarek King (Young Boy), Sarah Robson (Dr. Amelia Hamilton), Harriet Sansom Harris (Sinead), Dawn Greenidge (Pedestrian Woman)
STORY BY: Greg Berlanti | TELEPLAY BY: Andrew Kreisberg and Michael Grassi