So far this season, the CW line-up of DC superhero shows has kept its episodes action-packed. The Flash had to deal with an entire alternate timeline, the lasting effects of which weren't just felt in Central City. Arrow has taken on a new team of raw recruits to battle the ongoing dangers in Star City, and the Legends of Tomorrow crew joined forces with the 1940s Justice Society of America.

The latest addition to The CW primetime, Supergirl, revealed an Earth full of hidden aliens. That may well tie in to the upcoming four-show crossover, where the Girl of Steel helps her alternate-Earth friends battle a horde of invading aliens named The Dominators. Actress Melissa Benoist recently expressed her excitement at joining forces with the other DC series, saying "I think Kara just wanted to be accepted and be like a part of the cool kids, and I felt the same way."

That enthusiasm for hanging with her fellow heroes is obvious in the latest promotional images from EW, which you can view below. Benoist wasn't the only one, either, as Candice Patton (Iris West) was also thrilled to be a part of the epic team-up.

"I was geeking out. It’s so cool, especially as a girl, and a young girl who grew up looking up to those characters."

[vn_gallery name="Arrowverse Crossover EW Images" id="838940"]

The images also include some stills from the crossover, which will begin at the very end of Supergirl and continue across the remaining three shows in a single week. Cisco (Carlos Valdes) looks unsurprisingly smitten at meeting Kara, and since the Dominators may have some mind-control powers, we can't be sure if The Flash and Green Arrow are fighting alongside Diggle (David Ramsey) or hiding from him.

The inclusion of Legends of Tomorrow means we may not always be in present day, which could explain that image of Sara (Caity Lotz) with sister Laurel (Katie Cassidy), who was killed last season on Arrow by Damien Darhk. We also have questions about Ray (Brandon Routh) in his recently destroyed Atom suit.

Arrowverse executive producer Greg Berlanti has said that the showrunners' aim is to create stories that are "fun and enjoyable," but also with substance. From the looks of the photos, this ambitious crossover event should be plenty of fun, and the addition of both good and menacing aliens into a suspicious Green Arrow's world will definitely pump up the drama.

Supergirl airs Mondays at 8pm on The CW, The Flash airs in the same timeslot on Tuesdays, Arrowon Wednesdays, and Legends of Tomorrow on Thursdays.

Source: EW, CBR