Worlds Finest

{{Long plot|section|date=May 2019}}

At the DEO, Siobhan Smythe is treated for her fall. The doctor cannot explain her new powers, but confirms she is still human. As she leaves, Siobhan overhears Leslie Willis a.k.a. Livewire being interrogated and starts seeing images of a banshee. The visions continue as she returns to CatCo, where Cat advises Kara about her relationship with James. Siobhan's hypersonic scream sends Kara flying out the window, but a dimensional breach opens and someone rushes out at a high speed and catches Kara, letting her down in a field.

The speedster introduces himself as Barry Allen, a.k.a. the Flash, a superhero from a parallel Earth, after Kara reveals herself as Supergirl, and Barry later learns her extraterrestrial origin. 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. Fascinated by each other's origins, Kara and Barry quickly become friends, and Kara offers to help Barry find a way home. Winn also befriends Barry attributable to his own fascination with parallel universes, but James is overawed by Barry's abilities. Cat calls the four into her office and demands they research the new superhero, rejecting Barry's idea to call him the Flash.

Siobhan's aunt Sinead tells her of a banshee's curse on their family. If wronged by others, Smythe women are possessed and develop a powerful wail that belongs to the spirit{{mdash}}to combat the curse, one must kill whoever wronged them. Siobhan concludes she must remove Supergirl to get Kara, unaware they are the same person, and frees Livewire. Cat refuses to go into hiding, so Kara asks for Barry's help and they pinpoint Livewire's location.

The Flash attacks Livewire with lightning, but this charges her powers. Supergirl tries to short out Livewire, but Siobhan, now calling herself Silver Banshee, screams and disorients her. The heroes retreat and Kara apologizes for going in without a plan. Barry recalls his similar experience with Roy Bivolo, advising her to practice patience. Barry develops ear buds to dampen Silver Banshee's scream based on those he used against Hartley Rathaway. Livewire and Silver Banshee kidnap Cat and demand the two heroes come to National City Park.

Livewire wreaks havoc before Supergirl and Flash arrive. Supergirl frees Cat before engaging Silver Banshee; Flash tackles Livewire, but she knocks him out. Livewire attacks a passing helicopter, but Supergirl takes the blow to protect the people below. The crowd surrounds her, and firefighters blast Livewire with water, causing her to lose control and shock Silver Banshee, defeating both. National City hails Supergirl as a hero again. With Flash's help, the police develop a means of incarcerating metahuman criminals, imprisoning Livewire and Silver Banshee.

Cat reveals to Kara that she knew Barry was the Flash all along. At the field, Barry determines the kinetic energy from their combined running speed, with the tachyon device active, should create a breach back to his Earth. The two bid farewell before Barry enters the portal. Kara confesses her feelings to James, but he unemotionally walks out. Kara sees all the citizens acting similarly, marching in synchronicity. Non is revealed to be behind these events, as Myriad takes effect.

In November 2014, creator Greg Berlanti expressed interest in Supergirl existing in the Arrowverse, the same universe as his other series Arrow and The Flash,{{cite magazine |last1=Stack |first1=Tim |last2=Brissey |first2=Breia |date=December 5, 2014 |title=The Man Behind the Masks |magazine=Entertainment Weekly |publisher=Time Warner |issue=1340 |pages=42–46 }}{{Cite AV media |url=https://www.youtube.com/watch?v=I1GOM-kNjq8 |title=Vixen: Series Premiere Featurette: CW Seed |author=CW Seed |publisher=YouTube |date=August 21, 2015 |time=0:11 |access-date=August 22, 2015}} and in January 2015, The CW president Mark Pedowitz revealed that he was also open to a crossover between the series and networks (due to Berlanti executive producing all three and The CW being co-owned by CBS). However, CBS Entertainment chair Nina Tassler stated that month that "those two shows are on a different network. So I think we'll keep Supergirl to ourselves for a while."{{cite web |url=https://www.ign.com/articles/2015/01/12/cbs-president-nina-tassler-doubtful-about-a-supergirlflasharrow-crossover |title=CBS President Nina Tassler Doubtful About a Supergirl/Flash/Arrow Crossover |last=Cornet |first=Roth |work=IGN |date=January 12, 2015 |access-date=January 22, 2015}} In August 2015, Tassler revealed that while there were no plans at the time to do crossover storylines, the three series would have crossover promotions.{{cite magazine |url=https://www.ew.com/article/2015/08/10/cbs-edges-closer-supergirl-arrow-flash-crossover |title=CBS edges closer to 'Supergirl,' 'Arrow,' 'The Flash' crossover |last=Abram |first=Natalie |magazine=Entertainment Weekly |date=August 10, 2015 |access-date=August 11, 2015}}

In January 2016, during the Television Critics Association press tour, Pedowitz said that The CW was still interested in a crossover with Supergirl if the producers could find a way to do it,{{cite web |url=https://variety.com/2016/tv/news/the-cw-female-superhero-show-vixen-1201676210/ |title=CW President Teases Female Superhero Show, Talks 'Supernatural' Future and Stands By 'Crazy Ex-Girlfriend' |work=Variety |last=Wagmeister |first=Elizabeth |date=January 10, 2016 |access-date=January 10, 2016}} and Berlanti added that while no official conversations had taken place, internal ones had concerning how a crossover would work. He also noted that for a crossover to happen during Supergirl{{'s}} first season, it would have to be figured out "in the next month or so".{{cite magazine |url=https://www.ew.com/article/2016/01/10/supergirl-crossover |title=Supergirl evolving as Flash crossover deadline nears |last=Hibberd |first=James |magazine=Entertainment Weekly |date=January 10, 2016 |access-date=January 10, 2016}} Glenn Geller, Tassler's successor at CBS, then stated on the matter, "I have to be really careful what I say here. Watch and wait and see what happens."{{cite web |url=https://www.thewrap.com/cbs-president-teases-supergirl-the-flash-crossover/ |title=CBS President Teases 'Supergirl'-'The Flash' Crossover |last=Ge |first=Linda |work=TheWrap |date=January 12, 2016 |access-date=January 12, 2016}}

On February 3, 2016, it was announced that Grant Gustin, who appears as Barry Allen / Flash on The Flash, would appear in the eighteenth episode of the first season, "Worlds Finest".{{cite web |url=http://thefutoncritic.com/listings/20160309cbs01/ |title=(#SG118) "Worlds Finest" |work=The Futon Critic |access-date=March 9, 2016}} While no plot details on the episodes were released at the time, Ross A. Lincoln of Deadline Hollywood noted that "the in-universe reason" for the crossover was due to Barry's ability to travel to various dimensions, thus implying that Supergirl exists on an alternate Earth to Arrow and The Flash in a multiverse.{{cite web |url=https://deadline.com/2016/02/supergirl-the-flash-crossover-official-in-march-1201695796/ |title=Crossover Confirmed: 'The Flash' To Meet 'Supergirl' In March Episode |last=Lincoln |first=Ross A. |website=Deadline Hollywood |date=February 3, 2016 |access-date=February 3, 2016}} The earth that Supergirl inhabits is Earth-38 in the Arrowverse multiverse,{{cite web |url=https://collider.com/the-flash-recap-invasion/ |title='The Flash' Recap: "Invasion!" – The Gang's All Here |last=Day |first=Carla |work=Collider |date=November 29, 2016 |access-date=November 30, 2016}} and has been informally referred to as "Earth-CBS" by Marc Guggenheim, one of the creators of Arrow.{{cite magazine |url=https://www.ew.com/article/2016/10/18/arrow-crossover-100-episode-spoilers |title=Arrow boss teases 100th episode, crossover catalyst |last=Abrams |first=Natalie |magazine=Entertainment Weekly |date=October 18, 2016 |access-date=October 18, 2016}} "Worlds Finest" loosely intersects with the events of The Flash season 2 episode "Versus Zoom".{{cite web|url=https://www.ew.com/article/2016/03/18/supergirl-flash-crossover-spoilers|title=Supergirl-Flash crossover: Everything you need to know, straight from set|work=Entertainment Weekly's EW.com|access-date=2020-04-17|archive-date=2016-03-20|archive-url=https://web.archive.org/web/20160320153150/http://www.ew.com/article/2016/03/18/supergirl-flash-crossover-spoilers|url-status=dead}}{{cite web|url=https://deadline.com/2016/03/supergirl-flash-crossover-spoilers-melissa-benoist-grant-gustin-andrew-kreisberg-cw-cbs-1201727447/|title='Supergirl'-'Flash' Crossover: EP Andrew Kreisberg On How It Came Together - Deadline|author=Dominic Patten|work=Deadline|date=29 March 2016 }}{{cite web|url=https://www.cinemablend.com/television/Why-Didn-t-Flash-Talk-About-Supergirl-Crossover-All-132957.html|title=Why Didn't The Flash Talk About The Supergirl Crossover At All?|last=Holmes|first=Adam|work=CinemaBlend|date=April 22, 2016|access-date=April 25, 2016}}

In the United States, the episode received a 1.7/6 percent share among adults between the ages of 18 and 49, meaning that it was seen by 1.7 percent of all households, and 6 percent of all of those watching television at the time of the broadcast. It was watched by 7.17 million viewers.{{cite web |url=http://tvbythenumbers.zap2it.com/2016/03/29/monday-final-ratings-march-28-2016 |title=Monday final ratings: 'Supergirl', 'Blindspot' and everything else hold |last=Porter |first=Rick |work=TV by the Numbers |date=March 29, 2016 |access-date=March 29, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160402052950/http://tvbythenumbers.zap2it.com/2016/03/29/monday-final-ratings-march-28-2016/ |archive-date=April 2, 2016}} Within a week of its release, "Worlds Finest" had been watched by 9.63 million U.S. viewers.{{cite web |url=http://tvbythenumbers.zap2it.com/2016/04/18/broadcast-live-7-ratings-march-28-april-3-2016 |title=Broadcast Live +7 ratings: 'The Big Bang Theory' and 'Empire' lead the week of March 28 – April 3 |last=Porter |first=Rick |date=April 18, 2016 |work=TV by the Numbers |access-date=April 18, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160419083630/http://tvbythenumbers.zap2it.com/2016/04/18/broadcast-live-7-ratings-march-28-april-3-2016/ |archive-date=April 19, 2016}}

File:Grant Gustin SDCC 2017.jpg received critical acclaim for his appearance as The Flash]]

Cliff Wheatley of IGN gave the episode an 8.6/10, stating "After the grim 'n' gritty Batman v Superman, Supergirl's "Worlds Finest" offered a fun, upbeat palette cleanser and one of the series' strongest episodes to date. Instead of the usual "beatdown" introduction, Supergirl and the Flash went straight to being superfriends, which was refreshing. Not only did Barry Allen fit perfectly in Kara's world, but actors Grant Gustin and Melissa Benoist had fantastic chemistry together onscreen. While the city's turnaround on Supergirl's Red K incident was a little sudden, overall, "Worlds Finest" was delightful."[https://www.ign.com/articles/2016/03/29/supergirl-worlds-finest-review "SUPERGIRL: "Worlds Finest" REVIEW"] from IGN (March 29, 2016)

Caroline Siede of The A.V. Club gave the episode an A−, stating "My biggest fear going into "World's Finest" was that the episode would be a fun one-off designed to convert Flash fans into Supergirl fans (and vice versa, I suppose) while ignoring the compelling narrative Supergirl has been exploring since Kara went bad in "Falling". Instead "World's Finest" relies heavily on Supergirl's long-term storytelling, pulling together threads from the entire season into one jam-packed episode. And it does so while introducing the most enjoyable superhero team-up this side of The Avengers. For better or for worse, "World's Finest" represents Supergirl in a nutshell: Fun, clunky, cheesy, and more intelligent than it seems at first glance."[https://www.avclub.com/supergirl-and-the-flash-team-up-for-the-dawn-of-inspiri-1798187379 "Supergirl and The Flash team-up for the dawn of inspiring superheroes "] from The A.V. Club (March 28, 2016)

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{{reflist}}

• {{IMDb episode|5238952}}

{{Arrowverse}}

{{Supergirl (TV series)}}

{{The Flash (2014 TV series)}}

{{DEFAULTSORT:Worlds Finest}}

Category:2016 American television episodes

Category:Arrowverse crossover episodes

Category:The Flash (2014 TV series)

Category:Supergirl (TV series) episodes

Category:Television episodes about curses

Category:Television episodes about fairies

Category:Television episodes about friendship

Category:Television episodes about parallel universes

Category:Television episodes about spirit possession

Category:Television episodes about transhumanism

Category:Television episodes written by Greg Berlanti

Category:Television episodes written by Andrew Kreisberg

Category:Television episodes set in the 2010s