‘Flash,’ ‘Arrow,’ ‘Supergirl,’ ‘Legends Of Tomorrow’ Crossover Spoilers, Title & New BTS Photo Revealed! Crossover Catalyst Will Break Hearts

The four-way crossover event of "Flash," "Arrow," "Supergirl," and "Legends of Tomorrow" has revealed the episode title alongside a new behind-the-scenes photo of the cast. The title of the crossover catalyst serves as a nod to a storyline from the comic books.

"Arrow" producer Marc Guggenheim Guggenheim said that the four-way crossover event is titled "Invasion!" It is the 100^th episode of "Arrow" or episode eight of Season 5, ComicBook.com reported. The 100^th "Arrow" episode will also see the return of Jamey Sheridan, Katie Cassidy, Susanna Thompson, John Barrowman, and Neal McDonough.

The "Flash," "Arrow," "Supergirl," and "Legends of Tomorrow" crossover event will showcase the villainous alien race called Dominators, Parent Herald previously reported. The Dominators is technologically advanced and they will team up with other extraterrestrial races to invade Earth and put a stop to the growing number of metahumans or superhumans in the planet.

Rick Gonzalez, who portrays Wild Dog on "Arrow," recently shared a behind-the-scenes photo from the four-way crossover event. Check it out below.

The superhero committee. pic.twitter.com/4YwPQRjTYF

— Rick Gonzalez (@officialrickg) October 22, 2016

The behind-the-scenes photo of the "Flash," "Arrow," "Supergirl," and "Legends of Tomorrow" crossover event showcased Ragman (Joe DiNicol), The Flash (Grant Gustin), director James Bamford, Mister Terrific (Echo Kellum), Wild Dog, and Supergirl/Kara Danvers (Melissa Benoist). Stephen Amell, who plays the titular character Oliver Queen on "Arrow," is absent from the snapshot.

Fans should expect Wild Dog to clash and disagree with the heroes, specifically Flash and Supergirl, according to a separate report from ComicBook.com. Wild Dog will dislike the metahumans and the possible dire consequences of their special abilities instead of being amazed by it. Sara (Caity Lotz) and Diggle (David Ramsey), meanwhile, will welcome the superheroes with open arms.

Guggenheim recently said that the "Flash," "Arrow," "Supergirl," and "Legends of Tomorrow" event is a three-part crossover story that has a beginning, middle, and an end, Entertainment Weekly reported. Guggenheim only has praises for Amell's performance in the 100^th "Arrow" episode, saying that it is the actor's finest. The exec said there was this one scene "that really has two moments within the one scene" and it will break viewers' hearts.

"It will take your heart, pull it out, and stomp it on the floor. It's very, very affecting," Guggenheim added, as quoted by EW.

The weeklong "Flash," "Arrow," "Supergirl," and "Legends of Tomorrow" crossover event will begin on Nov. 29. Are you excited for it? Tell us your thoughts below.