[SPOILERS for those not caught up on Supergirl and The Flash ahead.]
The CW's DC Comics shared universe -- consisting of Arrow, The Flash, and Legends of Tomorrow -- regularly features crossover episodes and events between the three shows. So, when it was announced that the network passed on another DC Comics show from super-producer Greg Berlanti, leaving CBS to pick it up, questions of whether Supergirl could (or would) ever join her fellow heroes on The CW began to arise almost immediately.
Recently, CBS announced The Flash's Barry Allen (Grant Gustin) will appear on the March 28 episode of Supergirl, confirming a crossover but offering little information about the actual episode. However, The Flash's recent episode, 'Welcome to Earth-2,' revealed the show will be connected to Supergirl through a shared DC Comics TV Multiverse. Now, to further excite fans about the crossover episode, Gustin posted a photo with Supergirl herself, Melissa Benoist, on set.
Gustin shared the behind-the-scenes photo (below) on Instagram of himself and Benoist in their superhero costumes with the caption, "Those two emblems look pretty good together…" Based on a previous Instagram post, Gustin also revealed the crossover episode will be the 18th of Supergirl's first season and will be titled 'Worlds Finest.' Meanwhile, in Gustin's tweet about 'Welcome to Earth-2,' he also announced he'll be shooting his scenes for Supergirl in Los Angeles for half a week.
Gustin's appearance on Supergirl won't be the first case of a DC Comics hero from a different television network appearing within the established universe of The CW's shows; John Constantine (Matt Ryan) of NBC's now-canceled Constantine guest starred in an episode of Arrow earlier in season 4. But, in that case, Constantine was always apart of the Earth-1 universe. Whereas the shot of Supergirl shown during Barry, Cisco (Carlos Valdes), and Dr. Harrison Wells' (Tom Cavanagh) trip to Earth-2 confirmed a larger DC TV Multiverse that many had previously suspected includes shows from other networks.
Certainly, the Gustin's photo doesn't offer too much in the way of information about how The Flash will travel to National City from Central City -- or why, for that matter. Given the amount of time he'll be spending shooting scenes for the crossover, though, we can presume he'll play a relatively large part in the episode -- most likely as much as, if not more than, characters from The Flash or Arrow appear when they guest star on their fellow CW shows.
That being said, as Gustin suggests, seeing the Supergirl and The Flash emblems side by side in one photo is sure to inspire further excitement among fans of the show and DC Comics that are looking forward to the crossover episode. Like The CW's annual crossover events -- which this year took time away from the shows' larger storylines in order to set up Legends of Tomorrow -- the draw of this particular episode will likely be seeing Gustin and Benoist fighting evil side by side as The Flash and Supergirl.
Supergirl airs Mondays @8pm on CBS. The Flash airs Tuesdays @8pm on The CW. Arrow airs Wednesdays @8pm on The CW. DC’s Legends of Tomorrow airs Thursdays @8pm on The CW.
Source: Grant Gustin