Gearbox trademarks "Z-Day" for use with videogames and movies

With three mysterious unannounced projects in the works, it's pretty obvious that Borderlands developer Gearbox likes to keep secrets.

The US Patent and Trademark Office, however, does not.

Siliconera sends word that Gearbox recently lifted its proverbial leg over "Z-Day." Unsurprisingly, the trademark involves videogames. However, action-adventure films were also mentioned, meaning that Gearbox probably has big plans for this one.

So, what is a "Z-Day"? Well, no one outside of Gearbox's impregnable (without an appointment) walls really knows. Popular speculation says "zombies," who seem like they'd be right at home on a resume that already includes Borderlands DLC The Zombie Island of Dr. Ned.

Expect more when Gearbox is good and ready - and not a moment sooner.