The CW is about to begin the anticipated "Supergirl," "The Arrow," "Legends of Tomorrow," "The Flash" crossover entitled "Heroes vs. Aliens," which kicks off in the final moments of the "Supergirl" November 28 episode. Exciting details have been out after the network released the official synopsis and posters.

Based on the 1988 comic book event miniseries "Invasion!" the TV version of "Arrow," "The Flash," "Supergirl," "Legends of Tomorrow" crossover starts in the final scenes of a "Supergirl" and continues in the other series. The heroes assembly will figure out a way to stop the mind-controlling aliens called The Dominators from governing the Earth.

According to Comic Book, CW did not entirely follow the book version of Invasion! crossover. In the comics, the Dominators were secretly building their own super-race, which resulted to new sets of superheroes in the course of the story. In the TV version, on the ther hand, the threathening aliens will be mind controlling rather than assembling a loose alliance.

Meanwhile, CW releases the 4 Heroes vs. Aliens synopses, with so much exciting details on the crossover events to glean from. You may check them out via Coming Soon. But here's the primer episode spoilers for the crossover event.

"Supergirl" season 2 episode 8, Medusa: "A NIGHT OF CONFESSIONS; THE EPIC SUPERHERO CROSSOVER KICKS OFF TONIGHT - Eliza (guest star Helen Slater) comes to town to celebrate Thanksgiving with her daughters. Alex (Chyler Leigh) decides it's time to come out to her mother; Kara (Melisa Benoist) is shocked when Eliza suggests Mon-El (Chris Wood) has feelings for her, and Winn (Jeremy Jordan) and James (Mehcad Brooks) consider telling Kara the truth about the Guardian. Meanwhile, CADMUS unleashes a virus that instantly kills any alien in the vicinity so Kara enlists an unexpected ally - Lena Luthor (Katie McGrath). The epic superhero crossover kicks off tonight when Barry Allen (guest star Grant Gustin) and Cisco Ramon (guest star Carlos Valdes) seek Kara's help with an alien invasion on their Earth. "

Aside from the 4 synopses, the network also released the official posters of the "Supergirl," "The Arrow," "Legends of Tomorrow," "The Flash" crossover. As seen via CBR, the cast are posing in front of a new S.T.A.R. Labs facility akin to that Hall of Justice of "Justice League" in the comics. Additionally, each show gets a poster.

No need to wait much longer as "Arrow," "The Flash," "Supergirl," "Legends of Tomorrow" crossover's primere episode starts next week, Monday, on November 28.