Zack Snyder celebrated his birthday on Wednesday by giving fans a gift: the director posted a short video to tease an underwater Aquaman sequence from Justice League.

In the brief video, Aquaman (Jason Momoa) is shown swimming up to an unidentified figure — perhaps Orm, Aquaman’s villainous half-brother. That character, who is also known as Ocean Master, is played by Patrick Wilson in the standalone Aquaman film that James Wan is directing; the teaser released by Snyder indicates Omn may also briefly feature in Justice League later this year.

Directed by Snyder, Justice League also stars Ben Affleck as Batman, Gal Gadot as Wonder Woman, Ray Fisher as Cyborg, Ezra Miller as The Flash, and more. The film is out on Nov. 17.