With filming under way on the highly anticipated Arrow/Flash crossover, photos have begun to trickle out from the Vancouver set, and the Daily Mail was quick to gather them up.

The images include shots of stars Stephen Amell and Grant Gustin, the former both in costume and out, and the latter gleefully clicking his heels between takes. The social media-savvy Amell also tweeted his own crossover tease, which you can see below, along with a couple of the set photos (see more at the Daily Mail).

Amell got in on the picture-revealing action when he tweeted out this image with the message, "Hanging with @grantgust --"

The Flash premieres Oct. 7, while Arrow returns for its third season the next day. The two-hour crossover occurs as both series reach their eighth episodes.

 

Hanging with @grantgust -- pic.twitter.com/7HytlPuE4M

— Stephen Amell (@amellywood) September 24, 2014