Halo 4's Spartan Ops Episode 7 trailer sets up a three-way war

The events of the first half of Halo 4 Spartan Ops' season of content are coming to a boil in this trailer for Episode 7, which will further expand the game's co-op campaign Jan. 28.

Titled "Invasion," the seventh episode sees questionable medical practitioner Halsey forging a deal with a Covenant terrorist in order to gain access to the Librarian, a Forerunner leader who serves an important role in the Halo 4 campaign. That certainly causes some tension among the crew of Infinity, who are simultaneously fighting off a Promethean invasion.

Check out the trailer above for a cross-section of the episode's content. For more on the second half of Spartan Ops Season One, check out our recent interview with 343 Industries' David Ellis.