"The Flash" star Grant Gustin offered a little preview of his trip to "Supergirl's" world with a new photo on his Instagram. The snapshot features both Gustin and Melissa Benoist standing side-by-side in costume.
"Those two emblems look pretty good together," he wrote.
Gustin will appear as The Flash on the March 28 episode of "Supergirl." Details on the episode -- including the plot, how exactly Barry Allen finds himself in "Supergirl" territory and the extent of his role in the episode -- have not yet been released.
He also snapped a picture of his chair on "Supergirl" with a tongue-in-cheek message to "The Flash's" producers.
"Supergirl" airs Mondays at 8 pm EST on CBS. Developed by producers Greg Berlanti, Ali Adler and Andrew Kreisberg, the series stars Melissa Benoist, Calista Flockhart, David Harewood and Chyler Leigh.