Now that the introductions are out of the way, the latest trailer for the CW's massive Arrowverse crossover reveals exactly our heroes are going up against.

In a new teaser for the four-night event, which will see the heroes of Supergirl, The Flash, Arrow and Legends of Tomorrow team up, we get our first look at the Dominators, an alien race with the power of mind control.

"These things are like World War Z zombies!" Barry (Grant Gustin) exclaims.

The trailer also reveals the anticipated return of Deathstroke (Manu Bennett), Felicity (Emily Bett Rickards) and Cisco (Carlos Valdes) teaming up in the field, and a very unhappy Oliver (Stephen Amell).

"You really did it this time," Oliver yells at Barry. "You ask for my help, and then we end up the creek!"

The "Heroes vs. Aliens" crossover event kicks off at the end of Supergirl on Monday, Nov. 28 and will continue throughout the week on The Flash, Arrow and Legends. Are you excited?

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