When The CW scooped up Supergirl from its original home on CBS, it was all but guaranteed that the latest addition to the network's ever-expanding superhero line-up would crossover with her crime-fighting counterparts. The CW has done a great job of setting the landscape for crossovers between Arrow, The Flash and Legends of Tomorrow by setting up characters on a parent show before spinning them off into their own vehicle. And the opportunity for interconnected adventures has only grown more freewheeling and fun since the introduction of time travel on Legends and alternate dimensions on The Flash.

This morning, CW President Mark Pedowtiz confirmed those suspicions when he told the folks at upfronts, "“Next season, Arrow, The Flash, Legends of Tomorrow, and nowSupergirl will join forces in our annual crossover event, our biggest ever.” Now, the network has teased the upcoming superhero bonanza with a new trailer showing off the world of superheroes they've built. Check it out below:

After last year's first big crossover during the inaugural season of The Flash, this season boasted two major events. The first, a two-episode crossover between The Flash and Arrow that introduced Vandal Savage and set the stakes for Legends of Tomorrow, and the second, Barry Allen's skip over to Metropolis for the Supergirl crossover episode, which officially introduced Melissa Benoist's Kryptonian crimefighter to The CW's DC Universe. Basically, they tend to treat these crossovers as major storytelling events, usually to help expand their existing universe. Which kind of makes ya wonder what exactly will come in the wake of the massive four-series event.

What's also interesting is that they've opted to include, not one, but two very clear shots of Megan E.K.'s Vixen, who headlined an animated series on CW Seed before making her live-action debut on this season of Arrow. Given that that's more screen time than they gave to half the members of Legends of Tomorrow, I wouldn't be surprised if the network has big plans for the character ahead. With that in mind, it's worth noting that with the addition of Supergirl, The CW now has four out of five weekdays bedecked with a DC property, could Vixen be the fifth? Only time will tell, but if the current trajectory of the network is any indication, you can place safe money on the introduction of a new series before too long.

For more from the CW upfronts, click here for next year's schedule and check out the new series trailer here.

arrow-the-flash-crossover-stephen-amell-grant-gustin
Image via The CW
the-flash-arrow-crossover-picture
Image via The CW
the-flash-supergirl-crossover-worlds-finest-image-9
Image via CBS