Ever since Barry Allen (Grant Gustin) was introduced in "Arrow" season 2, it gave birth to a new universe and his own show. Now, fans are about to witness the Arrowverse crossover that includes "Arrow," "The Flash," "Legends of Tomorrow," and "Supergirl."

As Barry is now getting married to Iris West (Candice Patton), it will feature a big event that will reveal four show crossovers in two nights. However, the couple's special occasion will be graced by some unwelcome guests from Earth-X.

Earth-X villains will be interrupting the ceremony, thus the superheroes will be reunited to save the world. In the second part of the Arrowverse crossover in "Arrow" season 6 episode 8, titled "Crisis on Earth-X, Part 2," Citizen Cold (Wentworth Miller), The Ray (Russell Tovey), Felicity Smoak (Emily Bett Rickards), Alex Danvers (Chyler Leigh), and Iris will be seen as the Nazi versions of themselves.

Of course, Green Arrow (Stephen Amell), Supergirl (Melissa Benoist), The Flash (Gustin), and White Canary (Caity Lotz) will be leading the team to take their nemeses down. Talking about the much-awaited crossover, Maisie Richardson-Sellers, who plays Amaya in "Legends of Tomorrow," teased that fans are going to see "all of the fun scenes" as it will once again end in "Legends," Extra TV reported.

In fact, it will be "way bigger" compared to the Arrowverse crossover that happened last year. Aside from the much-awaited fight scenes, there will be love and loss that will feature a "very emotional journey."

On the other hand, Amell revealed that Green Arrow will have the most screen time in the four-episode crossover. He even described the much-awaited event as a "four-hour" escape. "Call it the crossover if you want. But it's kind of like calling the Super Bowl just a football game," Amell said during a recent interview on the "Arrow" set.

The two-night, four episodes Arrowverse crossover will start with "Supergirl" on Monday, Nov. 27, at 8 p.m. EST that will be followed by "Arrow" at 9 p.m. EST on The CW. It will continue in "The Flash" on Tuesday, Nov. 28, at 8 p.m. and "Legends of Tomorrow" at 9 p.m. EST also on The CW.