Arrow‘s Stephen Amell and The Flash‘s Grant Gustin recently discussed the upcoming two-hour crossover event.

Episode 8 of both The Flash and Arrow will be a two-night crossover event that begins in Central City before moving to Starling City. Amell and Gustin recently teased what fans can expect from the epic crossover.

The Arrow on ‘The Flash’

According to Gustin, while he and Amell “really get along outside of work,” the crossover has been exploring “Barry and Oliver kind of butting heads. We’re seeing them learn how to work together, but it’s really funny because they’re so different and the conversations they have are hilarious.”

Amell adds that an upcoming twist for Oliver will occur on The Flash portion of the crossover. “It’s my idea. I can’t tell you anything about it other than it relates to Central City,” he teases. “When I saw it in the Flash script, it ended up being really actually quite gratifying,” he says.

“I just thought it would be a cool idea. I thought it would be a cool idea for The Flash. It ended up being a cool idea that we were able to utilize me for because we were doing a crossover with The Flash. So it was very professionally gratifying.”

Character interactions

Amell goes on to say he was most excited for the interactions between Oliver and Barry. “I mean, episode 108 [of The Flash] is called ‘Flash vs. Arrow.’ Our titles aren’t just titles. You can bet based on the title that we fight.”

Beyond the leads, Amell “really enjoyed working with Carlos [Valdes, who plays Cisco]. He’s just a very, very fun character and I think that one of the most interesting parts about the whole crossover is an observation that Oliver makes about Harrison Wells.“

Both Amell and Gustin also mention David Ramsey (Diggle) as being a highlight. “I could not keep a straight face during any of David Ramsey’s lines during the crossover to the Flash. It destroyed me,” Amell says.

Gustin agrees. “David Ramsey is the funniest person in the world. 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.”

A whole new world

“Central City and Starling City are very different places,” Amell says. “When I go to Central City, it’s very much ‘All right, I’ll tag along, we’ll do things your way.’ And then, the very next night, in our episode it’s, ‘I’m sorry, we’re not in Central City anymore. We’re doing things my way. Things are different here.’

“So it’s a really interesting checkpoint for both shows because we’re able to teach these big lessons to the characters. So hopefully Oliver comes out of his trip to Central City having learned something and [Barry] comes out of his trip to Starling City having learned something as well.”

The Flash and Arrow crossover will air as the eighth episode of each series later this fall.

Are you looking forward to the ‘Flash’/’Arrow’ crossover?