Worlds Finest
| "Worlds Finest" | |
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| Supergirl episode | |
A promotional poster for the episode, inspired by the cover of Superman #199 (1967)
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| Episode no. | Season 1 Episode 18 |
| Directed by | Nick Gomez |
| Teleplay by | Andrew Kreisberg & Michael Grassi |
| Story by | Greg Berlanti |
| Production code | 4X7618 |
| Original air date | March 28, 2016 |
| Guest appearance(s) | |
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"Worlds Finest" is the eighteenth episode in the first season of the CBS television series Supergirl, which aired on March 28, 2016. The episode's teleplay was written by Andrew Kreisberg & Michael Grassi, and directed by Nick Gomez.
The episode features a crossover appearance by the title character of the CW series The Flash (also developed and produced by Greg Berlanti and Kreisberg), marking the first episode of the series to feature a character from the DC Universe that appears on another show, and the first character from a CW series to cross over to a CBS series before the show itself moved to the CW network.
The episode reunites Melissa Benoist with her former Glee recurring co-star Grant Gustin, who portrays the Flash. The episode title was inspired by the World's Finest Comics series, in which Superman would team up with various other DC superheroes, including the Flash.
At the DEO, Siobhan Smythe is treated for her fall, which was cushioned by a powerful sound wave. The doctor cannot explain her new powers despite DNA analysis confirms that she is human. Siobhan overhears Leslie Willis being interrogated and starts seeing images of a banshee. The visions continue as she returns to CatCo where Siobhan lets out a sonic scream that sends Kara flying out the window. A dimensional breach opens, someone rushes out at a high velocity and catches Kara before she hits the ground, letting her down in a field.
The speedster introduces himself as Barry Allen, (the Flash), a superhero from another universe, after Kara reveals herself as Supergirl (see Arrowverse). At CatCo, Barry meets Winn and James and explains the multiverse and how he reached their universe when testing a tachyon device fastened to his suit. In addition, Barry explains how he got his powers and thus revealing the case of metahumans, which designating Siobhan and Leslie's superhuman status despite not related to Barry's circumstance. Kara offers to help him return home. Cat calls the four into her office and demands they research the new superhero, rejecting the idea to call him the Flash. Siobhan's aunt Sinead tells her of a banshee's curse on the women in their family. If wronged by others, Smythe women are possessed by the banshee's spirit and develop a hypersonic scream—to combat the curse, one must kill the one who wronged them. Siobhan concludes she needs Supergirl gone to get at Kara, unaware they are the same person. She breaks Leslie out of the DEO with her scream. Cat refuses to hide after hearing of Leslie's escape. Kara and Barry pinpoint Livewire's location.
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