For the next three nights, your favorite TV superheroes from The Flash, Arrow, Supergirl and Legends of Tomorrow will be teaming up to fight the biggest threat yet—an alien race called the Dominators who come to Earth (well, Earth-1) because of something to do with metahumans.

In Monday's fall finale of Supergirl, we saw Barry (Grant Gustin) and Cisco (Carlos Valdes) hop over to Kara's (Melissa Benoist) house to ask for her assistance in fighting the invading aliens (hey, might as well get one on your side, right?). Tonight, we'll see the first part of the DC superheroes' adventure as they discover just who the Dominators are and attempt to figure out what they want—and over the subsequent two nights, we'll see the gang's quest to defeat them.

The Flash, Arrow, Legends of Tomorrow, Supergirl

The CW

Here's what else you can expect from the next three hours of DC TV goodness:

The Superhero Team-Up to End All Team-Ups: We might've gotten used to seeing the Flash, the Green Arrow, Supergirl and the various Legends of Tomorrow fight evil villains on our TVs on a weekly basis, but there's something extra thrilling about seeing the whole gang together. The Flash hour, especially, is great—we'll see a lot of fun interaction between people who don't typically talk to each other as they train together at a remote facility.

Major Fight Scenes: All that training will pay off, as there are extended, super-cool fight sequences in each episode.

Creepy-Looking Aliens: The Dominators don't look EXACTLY like they do in the comics, but they're definitely gross and scary-looking.

The Flash, Arrow, Legends of Tomorrow, Supergirl

The CW

Supergirl's Earth: Not that it actually makes a difference, but it's fun to know what number she's on.

A Worthy 100th Episode: Arrow's milestone episode just so happens to fall during this crossover week, and the writers have done an excellent job of figuring out a story that pays tribute to the long-running series (and fans who have stuck with it since season one) while also balancing the crossover aspect of it all. You'll see guest appearances by most of your favorite dearly departed cast members in an alternate universe story that actually makes a ton of sense.

A Major Breakthrough: Barry and Cisco have not been on the best of terms since Barry returned from Flashpoint, and we're happy to say that the crossover allows them to make major strides in repairing their relationship. Thank goodness.

A Blast to the Actual Past: The Legends might be back in 2016 helping out their friends, but their assistance will also require a quick trip back to the ‘50s for several members of the team.

The Flash airs Tuesday, Arrow airs Wednesday and Legends of Tomorrow airs Thursday at 8 p.m. on The CW.

What are you most excited to see in this year's big DC Week crossover? Leave your thoughts in the comments below!

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