Invasion of the UNSC Infinity

During the Requiem Campaign, the suffered an invasion by Jul 'Mdama's Covenant and Promethean troops looking to destroy the vessel and capture Doctor Catherine Halsey in order to further Jul's plan to acces the Librarian's imprint on Requiem.

Prelude
Six months after the Battle of Requiem, the returned to the shield world to set up research bases to study the Forerunner technology present while also fighting Jul 'Mdama's Covenant for control of the artificial planet. At the location known as the Cauldron, Spartan-IV Fireteam Crimson recovered a mysterious artifact which sucked in Doctor Henry Glassman when he accessed it aboard the. Subsequently, Doctor Catherine Halsey was brought aboard where she determined that the artifact was communicating information from the ship to Requiem.

As Halsey later attempted to understand the artifact, Jul 'Mdama utilized it to contact Halsey via her data pad to entice her into helping him, offering Halsey the truth about a great many things, including the Prometheans. As proof, Jul ensured that Fireteam Crimson retrieved "the Didact's Gift," a durance containing the "soul" of a Promethean Knight who was originally a human digitized by the Composer during the New Phoenix Incident. Having provided proof, Jul further enticed Halsey by mentioning the Librarian, but Commander Sarah Palmer noticed Halsey's suspicious behavior and Captain Thomas Lasky had her arrested. However, Halsey subsequently escaped using an override code on Infinity's AI Roland and made contact with Jul whose identity she quickly deduced. Halsey offered Jul her help with the Librarian, but the communication was cut off by Roland who regained control of himself and alerted the ship's crew to Halsey's actions.

The invasion begins
As Doctor Catherine Halsey was about to be escorted to a cryo chamber on the orders of Captain Thomas Lasky, Jul 'Mdama started an invasion of the ship through the artifact that had been brought aboard the. Promethean boarders translocated in, surprising the Infinity's Marines, led by Commander Sarah Palmer, who were unprepared for such an attack. Despite their best efforts, the Prometheans were able to make it out of the hanger containing the artifact and into the ship's hallways. As Lasky retreated into an elevator with Halsey, he ordered all hands to battle stations to defend the ship. Palmer quickly ordered all Spartan fireteams to fall back to Infinity to help as well, even those performing operations on Requiem. To help prevent the Infinity from escaping, Jul used the artifact to tether the ship to Requiem using an interdiction web.

By the time Fireteam Crimson returned from an aborted operation in Apex, the Infinity was also under attack from several s as well as numerous Phantoms and Banshees which had used Infinity's hanger bays to deploy Jul's Covenant troops aboard the ship as well. With the Infinity's defenses unable to pick out Crimson's captured Phantom from all of the enemy targets, the Phantom was accidentally shot down by friendly fire and crashed into Infinity's hanger bay.

List of appearances

 * Halo 4
 * Spartan Ops