The long-awaited crossover between The CW's four DC shows is nearly here, and a new trailer has been released. The event will span this week's episodes of Supergirl, The Flash, Arrow, and Legends of Tomorrow. Check the trailer out below:

　　The crossover event sees the heroes of all four shows come together to fight an alien race known as The Dominators. The event kicks off on Supergirl tonight, November 28, and will follow on The Flash, Arrow, and Legends of Tomorrow respectively over the next three nights. Arrow will also celebrate its 100th episode on Wednesday.

　　A cool found-footage style trailer for the event was also released last week--watch that at the end of this story.

　　Supergirl joined The CW earlier this year, having previously aired on CBS. The production of the show also switched to Vancouver from LA, reducing costs and making the logistics of the crossover event much easier, as the channel's other shows film there.

　　For more stories about The CW's roster of DC shows on GameSpot, check out:

　　Supergirl: Everything You Need to Know Before Watching Season 2Watch Superman Team Up With Supergirl in New Season 2 ClipLegends of Tomorrow's New Trailer Teases a Season Full of CrossoversThe Flash Season 3 Trailer Reveals an Alternate Reality and a Second FlashSupergirl and Arrow Team Up in New Image from DC TV Show CrossoverThe Flash, Arrow, Supergirl, and Legends of Tomorrow to Get CW's Biggest DC Crossover Ever