• The Flash is a CW Network series developed by writer/producers Greg Berlanti, Andrew Kreisberg and Geoff Johns.

The Flash is a CW Network series developed by writer/producers Greg Berlanti, Andrew Kreisberg and Geoff Johns. (Photo : Facebook/The Flash)

"The Flash" season 2 will have new details on the latest crossover episode with "Arrow" and episode 5's promo feature Doctor Light, Zoom and Earth 2 Harrison Wells.

The Episode 5 trailer for "The Flash" season 2 will feature the return of Harrison Wells (Tom Cavanagh) in the show teaming up with Barry Allen/The Flash (Grant Gustin), Caitlin Snow (Danielle Panabaker) and Cisco Ramon (Carlos Valdes), ComicBook reported. This version of Wells however, is from Earth 2 just like Jay Garrick (Teddy Sears) and he needs The Flash's help in stopping Zoom (Tony Todd).

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As seen on the trailer both Caitlin and Cisco are very much unnerved and skeptical about Earth 2 Harrison Wells since their version of the latter was killed by Eobard Thawne/Reverse-Flash (Matt Letscher) and assumed his identity in building S.T.A.R. Labs and the particle accelerator that transformed some of Central City's citizens into Metahumans, and was also responsible for the death of Barry's mother in the first season.

The Flash will also have to deal with Earth 2 Doctor Light and Zoom as well as Jay tells Barry that he is not ready to face Zoom while, Earth 2 Harrison Wells urges him to stop Zoom as that is "his job". Earth 2 Harrison Wells also revealed that he is responsible fro creating Zoom.

Earth 2 Harrison Wells is one of the few rumored identities of Zoom in season 2 alongside Edward Clariss/The Rival, Future Barry Allen, Earth 2 Wally West and Barry Allen, Hunter Zolomon and Eddie Thawne. Now that the promo revealed Wells being his creator, it is safe to assume that he is crossed out on the list and Zoom is an entirely different person.

In other news, "Arrow" star Stephen Amell revealed several details on the upcoming crossover episodes for "The Flash" and "Arrow" shows. Amell teased that crossover episodes of both shows will be different this time around and involves a common enemy and added that they have shot a scene with nine other superheroes.

Executive producer Andrew Kreisberg added that "The Flash" episode will be like "Arrows" and vice versa as fans speculated that the nine characters that will appear in the crossover are the main cast of the new spin-off series, "Legends of Tomorrow, Design&Trend reported.

The scene will likely be the same as the one shown in the "Legends of Tomorrow" trailer as both The Flash and Green Arrow (Amell) will gather several heroes and villains such as White Canary (Caity Lotz), The Atom (Brandon Routh), Firestorm (Victor Garber and Franz Drameh), Captain Cold (Wensworth Miller) etc. as they will face a new enemy in the form of Vandal Savage (Casper Crump).

"The Flash" airs on Tuesdays at 8pm ET on The CW Network.