8 Things To Expect From The Flash's Crossover With Supergirl

Nerd-offs, sing-offs, BFFs, and the implications of a shared universe.

by Andrew Pollard

After plenty of fan speculation and eternal optimism, Grant Gustin's Barry Allen has finally been confirmed to appear in an upcoming episode of CBS' Supergirl. Just the prospect of seeing The Flash sharing the small screen with the Girl of Steel is enough to get fanboys grinning from ear to ear, but there's so much potential in terms of what we can and (hopefully) will see play out between these two heroes. The fact that Gustin and Melissa Benoist know each other from their Glee days means that chemistry shouldn't be a problem for the two, and the energetic, fun tones of The Flash and Supergirl as shows should make for a great experience when the Scarlet Speedster arrives in National City. We don't know for certain how The Flash's appearance in Supergirl will play out, as in whether this 100% definitely means that Kara exists in a world that features The CW's Flash, Green Arrow, Atom, Firestorm, etc or if it could be a case of Barry possibly using his speed to hop to an entirely different world - a world that features CBS' Supergirl. Regardless, there's a whole heap of optimism for what lies ahead for Barry Allen when he crashes Supergirl's party next month. Based on what we know of both shows, their shared creators, and the acting talent involved, there are some things we should definitely expect from the Sultan of Speed's arrival in the world of Kara Zor-El.

Senior Writer
Senior Writer

Once described as the Swiss Army Knife of WhatCulture, Andrew can usually be found writing, editing, or presenting on a wide range of topics. As a lifelong wrestling fan, horror obsessive, and comic book nerd, he's been covering those topics professionally as far back as 2010. In addition to his current WhatCulture role of Senior Content Producer, Andrew previously spent nearly a decade as Online Editor and Lead Writer for the world's longest-running genre publication, Starburst Magazine, and his work has also been featured on BBC, TechRadar, Tom's Guide, WhatToWatch, Sportkskeeda, and various other outlets, in addition to being a Rotten Tomatoes-approved film critic. Between his main day job, his role as the lead panel host of Wales Comic Con, and his gig as a pre-match host for Wrexham AFC games, Andrew has also carried out a hugely varied amount of interviews, from the likes of Robert Englund, Kane Hodder, Adrienne Barbeau, Rob Zombie, Katharine Isabelle, Leigh Whannell, Bruce Campbell, and Tony Todd, to Kevin Smith, Ron Perlman, Elijah Wood, Giancarlo Esposito, Simon Pegg, Charlie Cox, the Russo Brothers, and Brian Blessed, to Kevin Conroy, Paul Dini, Tara Strong, Will Friedle, Burt Ward, Andrea Romano, Frank Miller, and Rob Liefeld, to Bret Hart, Sting, Mick Foley, Ricky Starks, Jamie Hayer, Britt Baker, Eric Bischoff, and William Regal, to Mickey Thomas, Joey Jones, Phil Parkinson, Brian Flynn, Denis Smith, Gary Bennett, Karl Connolly, and Bryan Robson - and that's just the tip of an ever-expanding iceberg. Where his beloved Wrexham AFC is concerned, Andrew is co-host of the Fearless in Devotion podcast, which won the Club Podcast of the Year gong at the 2024 FSA Awards.