The CW has released the first promo for this year’s four-way crossover between “Arrow,” “The Flash,” “Supergirl” and “Legends of Tomorrow.”

In the eight-second clip, Oliver (Stephen Amell), Barry (Grant Gustin), Kara (Melissa Benoist), Sara (Caity Lotz) and Alex (Chyler Leigh) are seen going to battle against what appears to be an army of rifle-wielding Earth-X Nazis.

“We fight to protect the people we love,” Oliver says in the video.

According to the official logline for the crossover, titled “Crisis on Earth-X,” all Arrowverse superheroes come to Central City for Barry (Grant Gustin) and Iris’ (Patton) wedding. But the festivities take an unexpected turn when villains from Earth-X arrive on Earth-1with a deadly agenda.

The crossover will also mark the live-action debut of gay superhero The Ray (Russell Tovey). According to the official description of the character, Raymond “Ray” Terrill was a reporter who discovered a group of scientists working on a secret project to turn light into a weapon of mass destruction. But before Ray could report on his discovery, the project leader tried to kill him by exposing him to a “genetic light bomb.” But instead of taking his life, the bomb gifted him with light-based powers which he uses in fighting violence and oppression wherever it exists.

In an interview with Collider last month, Arrowverse executive producer Todd Helbing revealed that this year’s crossover is more tonally cohesive than the previous ones. “We’re telling a four-hour movie. In the past, an ‘Arrow’ episode felt like an ‘Arrow’ episode, a ‘Flash’ episode felt like a ‘Flash’ episode, and ‘Legends’ felt like ‘Legends.’ With this crossover, we’re telling it like a collective story,” Helbing explained. “It’s so fun to see them all together, working together and being together for four hours. While we’re progressing the narrative on all four shows, it’s really this amazing through line for everybody.”

The crossover will air across two nights. It begins with “Supergirl” and “Arrow” on Monday, Nov. 27 at 8 p.m. EST, and ends with “The Flash” and “Legends of Tomorrow” on Tuesday, Nov. 28 at 8 p.m. on The CW.