Arrow, Flash, Supergirl & Legends Crossover Teased By Stephen Amell & Caity Lotz

Filming looks to be underway in Vancouver on the big upcoming Arrow, Flash, Supergirl and DC’s Legends Crossover.

Both Stephen Amell and Caity Lotz have taken to their social networks to tease a couple of pics.

“Coming Soon,” Amell posted on Facebook, with the pic revealing boots for Arrow, Supergirl, White Canary, Flash and what looks to be Atom.

Lotz posted her pic on Instagram featuring herself with Amell.

Some details known about the big crossover include that Supergirl will be featured in all of the shows as well as it will feature one big bad.

“I don’t like to oversell. [Supergirl] is going to be coming over but we’re not going to do a full on Supergirl crossover episode. I don’t want to give you the wrong impression,” EP Marc Guggenheim explained.

“I’m going to probably try to have one unifying threat, as opposed to different things on different ones, which is what the first year was,” executive producer Greg Berlanti teased while speaking with EW.

All four series air this Fall on The CW.