The CW has released the first teaser for the epic Crisis on Infinite Earths Arrowverse crossover event. Watch it here.

Things are heating up on all of the Arrowverse shows as we get closer and closer to the Crisis on Infinite Earths crossover event. We’re less than a month away from the first crossover episode, so the first teaser was long overdue. Check it out here, from the official Arrow Twitter account.

The teaser calls on the heroes to “suit up for the biggest crossover ever.” Among those who answer the call in the teaser are the Flash, Batwoman, Supergirl, Black Lightning, White Canary, Green Arrow, Brandon Routh’s Superman, and Jon Cryer’s Lex Luthor. They are all facing off against Mar-Novu.

Related: Crisis on Infinite Earths Arrowverse crossover will have aftershows hosted by Kevin Smith

The huge Crisis on Infinite Earths begins on Sunday, December 8, with a new episode of Supergirl. It then continues on Monday, December 9, and Tuesday, December 10, with Batwoman and The Flash, respectively. The event will conclude after the holidays on Tuesday January 14, with back-to-back episodes of Arrow and DC’s Legends of Tomorrow.