New 'Justice League' trailer, movie poster revealed at Comic-Con

Moderator Chris Hardwick, foreground right, takes a selfie with from left, Ben Affleck, Ezra Miller, Gal Gadot, and Ray Fisher at the Warner Bros. "Justice League" panel on day three of Comic-Con International on Saturday, July 22, 2017, in San Diego. (Photo by Richard Shotwell/Invision/AP)

Credit: Richard Shotwell

Credit: Richard Shotwell

Moderator Chris Hardwick, foreground right, takes a selfie with from left, Ben Affleck, Ezra Miller, Gal Gadot, and Ray Fisher at the Warner Bros. "Justice League" panel on day three of Comic-Con International on Saturday, July 22, 2017, in San Diego. (Photo by Richard Shotwell/Invision/AP)

Superhero fans, rejoice: A new "Justice League" trailer and movie poster have been revealed at Comic-Con in San Diego.

Time reported that the trailer released Saturday "hints at the appearance of a mysterious hero," possibly Superman or a Green Lantern.

The poster, which features Batman (Ben Affleck), Wonder Woman (Gal Gadot), the Flash (Ezra Miller), Cyborg (Ray Fisher) and Aquaman (Jason Momoa), features the words, "You can't save the world alone."