The greatest superhero crossover will happen in "The Flash" Season 3.  "Arrow" and "Supergirl" will join Flash in defeating aliens in the 8^th episode of the show entitled "Invasion."

The aliens called Dominators will invade Central City in the exciting new episode. It is not just the two superhero that will took part on the fight even the "Legends of Tomorrow" will be included on the episode.

According to Enstarz, a Flashpoint related secret will be revealed that will make the superheroes find it hard to trust each other. The site reported that this is CW's biggest crossover event so far.

They reported that the network has been planning this crossover for quite a while now. However, the production schedules made it hard to do a crossover event.

This is not the only fun thing that occurred in "The Flash" season 3. In "Killer Frost," Caitlyn Snow can be seen having a similar problem as Elsa from "Frozen".

Movie Pilot reported that the Queen of Arendelle and Snow seemed to be having similar problems in life. Kevin Smith, show runner of the series, explained that there are "Frozen" Easter eggs hidden on the episode.

He explained that there are a lot of hidden references to the beloved Disney show. Smith explained that there was an establishing shot of a frozen food place named Ledded Goh. This has been an exciting new season for the series.  In the end of the 2^nd season, Barry was able to go back in time and change his past.

Jobs & Hire reported that this caused Barry to return to an alternate reality where he has no powers and memory of his previous timeline. Upon realizing this, Barry then went to gain his power back by going to an unfamiliar world where Leonard Start is the most famous hero in Central City and Batman's father is the Dark Knight. "The Flash" Season 3 superhero crossover will happen on November 29.