Grant Gustin & Stephen Amell Film 'The Flash' & 'Arrow' Crossover - See the Pics!

Grant Gustin and Stephen Amell watch intently as their body doubles practice a scene on set on Wednesday afternoon (September 24) in Vancouver, Canada.

Our two favorite superheros are gearing up for the big crossover episode between The Flash and Arrow. We are so pumped to see it!

PHOTOS: Check out the latest pics of Grant Gustin

“We got got during rehearsal today & the shot is pretty awesome. @amelladventures @james2bambamford @jonkralt,” Grant tweeted about the photo.

10+ pics inside of Grant Gustin and Stephen Amell teaming up on set…