Supergirl, the other Arrowverse shows and Riverdale are all filmed in Vancouver – making Arrowverse crossover episodes a lot easier, and allowing for this kind of fun set visit between series.
The tweet, especially following Sacasa’s comments at WonderCon, has sparked speculation that Supergirl could appear on Riverdale in the upcoming second season.
Supergirl‘s Melissa Benoist paid a visit to the set of Riverdale and was snapped hanging out at Pop’s diner with Betty and Veronica.
The shot is taken through one of the cameras on-set, and is captioned “Look who dropped in to #Riverdale for a visit!