Halo 4: Spartan Ops (2013)
The events of "Halo 4: Spartan Ops" take place six months after "Halo 4"'s campaign. Infinity returns to Requiem, where Covenant insurgents—led by Jul 'Mdama, who styles himself as "the Didact's Hand"—and Prometheans are still active. Sarah Palmer, commander of the Spartan-IVs, deploys Spartan squads to clear out the Covenant and Promethean forces in Requiem's interior in order to set up research bases. Crimson Squad recovers a mysterious artifact excavated by Covenant; Infinity scientist Doctor Glassman disappears after studying the device.
Catherine Halsey is brought to Infinity due to her knowledge of Forerunner technology. She is kept under guard by marines and Spartans including Gabriel Thorne, who lost his family during the Didact's attack on New Phoenix. While studying the artifact, Halsey begins receiving messages on her computer from an anonymous sender. The source of the transmissions is 'Mdama, who captures Glassman and forces him to work on a Forerunner device that supposedly contains the Librarian. Pursuing 'Mdama's troops, Crimson Squad recovers another artifact. When Halsey examines the device, it displays images Thorne recognizes as depicting New Phoenix. Lasky reveals to Halsey and the Spartans that the UNSC knows Prometheans are former humans. Approaching the artifact looking for answers, Thorne is teleported to Requiem and captured by Covenant. Palmer arrests Halsey for communicating with 'Mdama. Thorne escapes captivity outside 'Mdama's base, and escapes with Glassman; they are rescued by Majestic Squad.
Halsey uses an override code to force Infinity's AI, Roland, to assist her. Seeking information withheld from her concerning the Librarian, Halsey learns that Master Chief is alive. ...
Did You Know? At the beginning of every Spartan Ops cinematic on the bottom right of the screen is a Latin phrase: "Per Mare. Per Terras. Per Constellatum." In English, this translates to, "By Sea. By Land. By Stars."