Warner Bros. wants to keep their San Diego Comic-Con 2014 Hall H experience a special one for attendees.

Though fans have uploaded photos and videos of the “Batman v. Superman: Dawn of Justice” trailer, Warner Bros. wants to keep the teaser off the Internet. Director Zack Snyder and cast members Henry Cavill, Gal Gadot and Ben Affleck made a surprise appearance at the convention.

Snyder helped unveil the short teaser as well as the Gadot’s new Wonder Woman costume. The appearance quickly became the most talked-about moment at the San Diego Comic-Con.

“[The teaser is] just going to live in that hall. We’ll post extended trailers and stills, but that presentation, that was just for those fans,” Sue Kroll, president worldwide marketing and international distribution, told Variety.

The video of the trailer can be found online, but Warner Bros won’t formally release the “Batman vs. Superman” teaser. Screen Crush shared a description of the trailer shown at the Warner Bros. Comic Con panel shortly after it premiered:

“The panel began with a teaser for the upcoming film, in which we see Ben Affleck’s Batman in an armored suit, standing on a rooftop in the rain. His eyes are glowing a mysterious blue. Batman rips a blanket off of the Bat signal and shines the spotlight into the sky. Just then we see Henry Cavill’s Superman hovering over the Bat signal, his eyes glowing red with rage. The trailer cuts back to Batman, his eyes still glowing a threatening blue, and the two look ready to brawl. The footage cuts to the official logo.”

You can watch the Comic-Con teaser recorded by a fan here. “Batman v. Superman: Dawn of Justice” will be released to theaters on May 6, 2016.