‘The Flash’ & ‘Arrow’ Casts Preview Two-Night Crossover Event

TV’s big crossover event of 2014 is nearly here.

The CW worlds of “The Flash” and “Arrow” merge in epic fashion as characters from both shows crossover to each other’s worlds this coming Tuesday and Wednesday night.

It’s “Flash Vs. Arrow” on “The Flash,” December 2, and just as the title indicates, there will be a matchup between Grant Gustin’s The Flash and Stephen Amell’s The Arrow. It has been confirmed that Felicity Smoak (Emily Bett Rickards) and John Diggle (David Ramsey) join Stephen’s Oliver Queen on a trip to Central City for the episode.

PHOTOS: ‘Flash Vs. Arrow’: Scenes From The CW Crossover Event

The following evening, on “The Brave and The Bold” episode of “Arrow” (Dec. 3), Barry (Grant Gustin), Caitlin Snow (Danielle Panabaker) and Cisco Ramon (Carlos Valdes) make the trek to Starling City.

Just a few weeks after shooting the episodes, “The Flash” and “Arrow” casts discussed the crossover action with TV reporters, while on their Vancouver sets.

WATCH: Grant Gustin: ‘The Flash’ & ‘Arrow’ Crossover Episodes ‘Fun & Exhausting’

Stephen Amell (Oliver Queen/The Arrow)

“Episode 108 is called ‘Flash Vs. Arrow,’ so our titles aren’t just titles,” Stephen said. “You can bet based on the title that we fight, so that whole dynamic, which took place over three nights of shooting, was a very new and different experience for me just from a technical standpoint because ‘The Flash’ has so many effects.”

The “Arrow” star said one the many things he enjoyed about the two-night TV event was working with the actor who plays “The Flash’s” Cisco. “I, personally, really enjoyed working with Carlos. He’s just a very, very fun character,” Stephen said. “And I think that one of the most interesting parts about the whole crossover is an observation that Oliver makes about Harrison Wells.”

Stephen also revealed that there’s an “Arrow” moment he came up with the idea for in “The Flash.” “I can’t tell you anything about it other than it relates to Central City and when I saw it in ‘The Flash’ script, it ended up being really actually quite gratifying,” Stephen said.

Grant Gustin (Barry Allen/The Flash)

“Barry and Oliver are kind of butting heads, but we’re seeing them learn how to work together. But yeah, it’s really funny because they’re so different, so the conversations they have are hilarious,” Grant said.

PHOTOS: ‘The Flash’ Comes To ‘Arrow’: Scenes From ‘The Brave & The Bold’

But, it’s one of the Starling City residents who provided the biggest chuckle for Grant. “David Ramsay is like, the funniest person in the world,” “The Flash” star said. “Think about Dig seeing The Flash and who Dig is and having to accept that this is reality. And he just plays that so well and [it’s] so funny. It’s great.”

Candice Patton (Iris West)

“She’s not super involved in any of the major action, but you guys know it’s Felicity and Oliver who come to Central City, and Diggle, and a few of them stop into Jitters,” Candice said of who coffee shop worker/The Flash blogger Iris might encounter. “There’s some interaction especially between Felicity and Iris and Iris and Oliver. It was really fun to work with Stephen and see the dynamic between Iris and Oliver,” Candice said, adding, “Iris likes Oliver!”

Rick Cosnett (Eddie Thawne)

Rick, who plays Iris’ boyfriend Eddie, said his character isn’t likely to be too bothered by Iris going doe-eyed over another blond hunk. “I don’t think much shakes Eddie because he’s so confident and so self-assured that little things like that — like I think he’s in her top three, and he’s pretty famous, so it’s one of those things like, ‘Yeah, that’ll never happen,'” Rick said.

Danielle Panabaker (Dr. Caitlin Snow)

“It actually begins in Central City. They come to us first and that’s a really cool journey. It’s awesome to see the contrast between the two main characters specifically —  between Arrow and Flash — and just the way they approach things and the way they think about things. So it was great to have them on our show and I think that Caitlin and Cisco are very relatable and that they can’t wait for the opportunity to get to Starling City and see what’s actually going on there,” Danielle previewed.

When Caitlin and Cisco arrive in the “Arrow” world, however, things take a dark twist. “There’s a sort of element of fun and fantasy that they have when they’re just sort of on the phone with The Flash, helping him do incredible things like save kids from burning buildings, but when they’re on the ‘Arrow,’ some really terrible things happen and they’re forced to deal with the reality of death and consequences to these things… in a very immediate way that they don’t generally get when we’re in Central City,” she added.

“The Flash” airs Tuesday at 8/7c, while “Arrow” airs Wednesday at 8/7c.

Production assistance provided by Warner Bros.

— Jolie Lash