Watch out "Avengers"! Here comes "Arrowverse" Crossover --"Arrow", "The Flash", "Supergirl" and "Legends Of Tomorrow". Finally, CW's superheroes are coming to meet one another on the upcoming crossover's "Supergirl" first episode. Alongside, the "Heroes VS Alien" episode synopses are already released.

The kick-off episode of "Supergirl"  will officially begin the "Arrowverse" crossover. Apparently, it was introduced in "Heroes VS Alien" trailer, in it "Arrow", "The Flash", "Supergirl" and "Legends Of Tomorrow" finally met each other. They will team up to defeat Dominators, who threatens human living.

According to GamenGuide, "Supergirl Medusa" episode on Nov. 28 is about Barry Allen and Cisco Ramon asking Kara's help about Dominators--alien threat. In "Arrowverse" Crossover, the Dominators wants to take over Earth and destroy human life.

While, "The Flash Invasion!" episode on Nov. 29 is the actual assembly of the new "Arrowverse" Crossover group of superheroes. Barry Allen, Green Arrow, Supergirl, and Legends of Tomorrow will plan an attack to finish off the Dominators. Then, they will find Flashpoint's secret that will wreck the team.

In a report by TV Line, it explains the next episode of "Arrowverse" Crossover--"Arrow Invasion!" episode on Nov. 30. It is referring to Oliver, his life seems so perfect. The Queen's Gambit never existed, accordingly, Robert and Moira Queen is with him while his fiancee Laurel plans their wedding. Yet! He realizes that it's too good to be true.

Lastly, On "Legends Of Tomorrow Invasion!" episode for Dec. 1, they will help "Arrow", "The Flash", "Supergirl" to finish the Dominators. How? Stein will something but will be hindered by something as they are led on the end of "Arrowverse" Crossover.

Even with the synopses, the "Arrowverse" crossover is a worthwhile series to see. Possibly, this is just a beginning for a big screen adaptation. For more news and updates, just stay tuned.