A selection of new teasers has been released for the Arrowverse’s upcoming Crisis on Infinite Earths crossover. The ambitious adaptation was officially announced by Arrow star Stephen Amell in December of last year. Set to air over five hours, the crossover event will see Oliver Queen (Amell) and the members of Team Arrow once again unite with the heroes of The Flash and Supergirl to halt the malevolent machinations of the Anti-Monitor (LaMonica Garrett). Original Crisis on Infinite Earths author Marv Wolfman reportedly helped craft the episodes.

After sitting out the Elseworlds storyline last year, the cast of Legends of Tomorrow will be an integral part this time around. The newest addition to the Arrowverse - Ruby Rose’s Batwoman - will also return to play a role. For the first time ever the cast of fellow DC show, Black Lightning, will also be featured after previously occupying its own separate corner of The CW’s universe. They will be joined by Smallville’s Tom Welling and Erica Durance, confirmed to be reprising their roles of Clark Kent and Lois Lane, respectively, as well as Tyler Hoechlin, who will return as the Earth-38 version of Superman. Brandon Routh will also don the famous red cape for the first time since Superman Returns, playing the Kingdom Come version of Superman. According to producer Greg Berlanti, all three versions of Superman will definitely appear on-screen together.

Eager fans can now get an early look at the action courtesy of some newly released teasers, with one being released for each of the five included shows. Compiled into one video (embedded below) by TV Promos, each shares a similar element of the heroes being recruited by Lyla Michaels, aka Harbinger. Though the character’s codename was first teased in Arrow season 1, the true extent of her recently revealed association with The Monitor have thus far remained a secret from the other characters. That appears to have changed by the time of the first teaser. Dressed now in her own comic book-inspired costume, Harbinger emerges to recruit Barry Allen. As fans are braced that they are about to “witness the end of existence,” Barry makes a vow to Iris he will run home to her.

Harbinger then attempts to recruit the new Caped Crusader by declaring “there is no more time” and “the multiverse is in grave danger.” With the build-up to Crisis on Infinite Earths largely seen on The Flash and Arrow episodes, Batwoman, of course, has little idea to what Harbinger is referring. Batwoman still joins the fight, however, seemingly seen later declaring she’s fighting to put things right. The rest of the heroes are then rapidly brought into the fold - with Sara Lance, in true sardonic Legends of Tomorrow fashion, calling it “the joy zone.”

In line with Crisis on Infinite Earths having Marvel-level spoiler protections, the promos successfully keep a lot in the dark beyond what is already known while promising some great action. It isn’t, however, without it’s ominously teasing imagery, including Superman’s cape hanging tattered on a pole. Nor is without a lot to get fans excited, including the first in-action look at Tom Cavanagh’s Pariah and numerous first encounters between various characters as he and Team Flash seemingly recruit an understandably anguished Black Lightning personally. While it remains to be seen whether Supergirl is right to be as optimistic as she seems, the promos will no doubt give fans a lot to talk about between now and the official release of the first Arrowverse crossover episode on December 8th.

More: How The Arrowverse Will Look Different After Crisis On Infinite Earths

Source: TV Promos