'The Flash': Grant Gustin Teases "Crisis on Earth-X" Crossover

The biggest event in The CW's Arrowverse each season is the crossover, and with the two-night event "Crisis on Earth X" coming in just a few short weeks, The Flash star Grant Gustin says this year's event is the biggest yet.

During an interview this week on the set of The Flash, Gustin told reporters that the upcoming "Crisis on Earth X" crossover is the biggest yet, so big that there really is no preparing for it.

"It was bigger than ever," Gustin said. "We knew it was going to be bigger than ever, too. But every year, you can't really prepare yourself. You think you're preparing yourself, knowing that the crossover is coming but it's a big thing. It's a really challenging feat. But I think this year, every year we top it. Again, we top it."

What makes this year's event so much bigger? Gustin explained that "Crisis on Earth X" brings together the most superheroes yet, but also retains some of the comedy that's appeared in the Arrowverse all season thus far.

"There's more people than ever included, some of the biggest sequences you'll see with the most superheroes we've ever seen together at any given time," he said. "But we stick also, at least The Flash side of things, we stick with the comedy we've had all year. That still exists within the crossover. Barry and Kara have a few interactions that are fun, classic Barry and Kara interactions. I meet a couple new characters. It's bigger than ever before."

Another part of what makes the crossover bigger this year is highly anticipated West-Allen wedding. With Barry back from the Speed Force, wedding planning has been in full force for he and Iris, and it's a wedding that will involve their friends from the other Arrowverse shows. According to Gustin, having the wedding be central to the crossover is very fitting given the history of The Flash.

"We've been leading up to this wedding for a long time," he said. "It's in some ways fitting that it's part of the crossover because it's also a little strange that we've been leading up to this wedding and it's not even on Flash, it's technically on a different show."

Set photos last month hinted that the West-Allen wedding might just be a double wedding with Arrow's Oliver and Felicity, and according to Gustin having Barry's wedding appear on Arrow just makes sense.

"I'm interested to see how some viewers feel about that," Gustin admitted. "But it's also how this show started, this show started on Arrow. We've consistently had these crossovers and we're bringing so many characters together for this wedding, it's kind of fitting that it happens somewhere else."

This year's four-part crossover will air across two nights Monday, November 27th and Tuesday, November 28th on The CW. For this crossover event, Arrow will air on a special night Monday at 9/8c following Supergirl, while the other DC shows will remain in their regularly scheduled time periods.

The Flash airs Tuesdays at 8/7c on The CW.