The second episode in Halo 4’s story-driven, episodic co-op adventure – entitled Spartan Ops – has had its trailer released.

The trailer features all-new CG cinematic and five new gameplay missions and is available from today (12 November) for download on Xbox LIVE.

The episode sees a mysterious artifact (recovered from Requiem) take control of vital systems on board the UNSC Infinity, forcing the Spartans of Crimson and Majestic back down to the planet to look for a way to free the ship.

Through a weekly series of cinematic episodes, Spartan Ops tells the continuing story of the UNSC Infinity, following the events of “Halo 4.” These episodes center on the UNSC Infinity leaders and crew as well as a new team of Spartans — Fireteam Majestic – as they explore the corners of Requiem in objective-based missions and help uncover the secrets of the mysterious Forerunner world. A massive adventure that builds off the “Halo 4” story, access to Spartan Ops is included with “Halo 4” at no additional charge — effectively delivering two campaign experiences in one game.

And just in case you missed it, here’s episode one’s trailer.