343 Industries released a new trailer for Episode 3 of the Spartan Ops cooperative mode in Halo 4. The trailer shows the return of Dr. Halsey and picks up right after the events of last week’s episode. The Forerunner artifact that was found continues to give the crew of the UNSC Infinity problems and Dr. Halsey is brought in to help figure it all out. The new episode is set to release Monday, November 19 at approximately 5 EST.