Arrow and The Flash will have their crossover episodes this fall!
Arrow and The Flash season crossover episodes will air this DecemberFacebook/CW

The much awaited Arrow and The Flash crossover episode synopsis is out.

The Flash episode is titled Flash vs. Arrow where Oliver, Felicity and his team visit central city to investigate a meta-human case.

The official synopsis reads:

"Barry is thrilled when Oliver, Felicity and Diggle come to Central City to investigate a case involving a deadly boomerang. Excited about teaming up with his friend, Barry asks Oliver if he'd like to help him stop Ray Bivolo (guest star Patrick Sabongui), the meta-human Barry is currently tracking. Bivolo causes people to lose control of their emotions and has been using that skill to rob banks. Unfortunately, the superhero partnership doesn't go as smoothly as Barry expected. When Oliver tells Barry he still has a lot to learn, Barry sets out to prove him wrong by attempting to stop Bivolo alone. However, when Bivolo infects Barry and sets him on a rage rampage, everyone is in danger, and the only one who can stop him is the Arrow. Meanwhile, Iris is furious when Eddie tries to get a task force to stop The Flash, Joe and Dr. Wells agree the Arrow is a bad influence on Barry, and Caitlin and Cisco deal with a new team in S.T.A.R. Labs."

Following this episode, Arrow will bring us the conclusion of the crossover with an episode titled, The Brave and The Bold, where Oliver and Barry will unite to save the city.

The official synopsis reads:

"Oliver, Arsenal and Diggle track down the location of a boomerang-wielding killer named Digger Harkness (guest star Nick Tarabay) but are surprised when they come face to face with an A.R.G.U.S. team. Diggle asks Lyla why A.R.G.U.S. is involved but she defers until Harkness attacks the building, killing several agents and targeting Lyla. The Arrow joins the fight and gets help from an old friend – The Flash. Harkness manages to get away and Oliver teams up with Barry again to find him before he can get to Lyla. When Harkness plants five bombs in the city that are timed to explode at the same time, both teams must come together to save the city."

Flash vs. Arrow will air on 2 December, while Arrow's The Brave & The Bold will air on 3 December on CW.

Also, The Flash's star Danielle Panabaker tweeted an image of the first semi-official look of the Reverse Flash in October.

The Flash Arrow Crossover episode
The man in the Yellow suit is reported the Reverse FlashDaniellePanabaker/Twitter

She said: Thank u @GBerlanti @AJKreisberg & @geoffjohns for the crepe truck! Love, the (now a little fatter) flash cast & crew pic.twitter.com/zYDZKHyKmA"

In the picture, the actress is thanking the cast and executive producers Geoff Johns, Andrew Kreisberg and Greg Berlanti.

Comicbook speculated that the poster features The Flash along with a yellow-and-black-clad character who seems to be the Reverse Flash character Professor Zoom.

Will the Reverse Flash appear in the crossover episode?

Here is the promo for next week's The Flash