Bungie announced at Gamescom 2014 that it currently has two expansions for Destiny in the works, each of which will introduce new competitive and cooperative adventures, as well as new weapons, armor, and player gear. The first of these expansions, titled The Dark Below will launch in December and introduce “its own story,” Bungie has said.

“We call it an expansion because it has one of all the activity types from Destiny, so it’s story, strike and beyond—and competitive and cooperative experiences in there,” Bungie Director of Production Jonty Barnes told Joystiq in an interview. “As well as new gear, new armor, new weapons and everything else.”

Barnes said that at least some of the new story content will take you through different parts of areas included in the main game, so you’ll still run into players who don’t have the expansion. “We always want to create spaces where people can get together and cooperate, and we feel like that is a big innovation in Destiny,” he said.

Bungie also released a trailer (above) showing off gameplay from the game’s Mars location.

Publisher Activision recently revealed that Destiny is the most preordered new IP in GameStop’s history. It launches September 9 for PlayStation 3, PlayStation 4, Xbox 360, and Xbox One.

For more on the game, be sure to read GameSpot Editor Kevin VanOrd’s feature on what to expect from Destiny’s competitive multiplayer mode, the Crucible.