In the next episode of "The Flash," Barry Allen a.k.a. The Flash (Grant Gustin) and Iris West's (Candice Patton) wedding brings everyone together but is interrupted by a gang of villains from Earth-X.

The trailer for the upcoming installment titled "Crisis on Earth X, Part 3" was just recently released and showed Allen in Star Labs telling his team, "Let's get to work." Apparently, Allen and West were supposed to get married but a host of villains from an alternate dimension crashed their ceremony and ruined the atmosphere. The bad guys are also up to no good and have a bigger agenda in mind. Allen will not be alone in this battle for he will be joined by fellow superheroes Supergirl (Melissa Benoist), Green Arrow (Stephen Amell), White Canary (Caity Lotz), and many others. Alex Danvers (Chyler Leigh) is shown loading her pistol while White Canary executes an attack with her staff.

In another scene, Kara Danvers opens her shirt to transform into Supergirl while Oliver Queen puts on his mask to become the Green Arrow. Everyone is taking their place to fight against the villains of Earth-X. The heroes appear in one slow-motion shot as they walk towards the battle. The Atom (Brandon Routh), Steel (Nick Zano), Heatwave (Dominic Purcell), and Mr. Terrific (Echo Kellum) are also in the extended team. It remains to be seen if the heroes will be able to take down the supervillains.

In the last episode, Allen and the team were able to identify the elusive Thinker (Neil Sandilands) and locate his whereabouts. However, they realized that they might be up against someone very powerful because of his unlimited intelligence. They decided to work extra hard to take down the genius villain.

"The Flash" season 4 episode 8 will air on Tuesday, Nov. 21 at 9 p.m. EST on the CW.