Halo 4 Spartan Ops Episode 5 trailer foreshadows ancient secrets and rescue missions

The trailer for Halo 4's Spartan Ops Episode 5, "Memento Mori," reveals what the team has unearthed: an alien artificial intelligence unit crammed with human-made memories.

As the Sangheili leader's plans begin to take shape, the crew of the Infinity discovers an unknown truth of the Forerunner Prometheans, unraveling what they previously knew about the race, and the Spartans must embark on a mission to rescue an ally. This latest episode will feature new CG cinematics and five additional chapters to play through.

Spartan Ops Episode 5 will be available for download on Xbox Live at 6 a.m. ET on Monday, Dec. 3.

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