We've known since July that The CW is planning a crossover for their superhero shows Arrow and The Flash. Today, we finally have the official details for both shows, which will air in a two-night crossover event starting with The Flash on Tuesday, December 2 and ending with Arrow on Wednesday, December 3.

The Flash kicks things off with the aptly titled "Flash vs. Arrow" on Tuesday, December 2, where Arrow's Oliver Queen (Stephen Amell), Felicity Smoak (Emily Bett Rickards) and Diggle (David Ramsey) pay a visit to Barry Allen (Grant Gustin) in Central City, which includes the introduction of Ray Bivolo, a.k.a. the Rainbow Raider.

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.

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The crossover action continues Wednesday, December 3 with the Arrow episode "The Brave and the Bold", which introduces Nick Tarabay as Digger Harkness, a.k.a. Captain Boomerang.

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.

Stay tuned for footage and photos from these episodes as we get closer to this CW crossover.