From Halopedia, the Halo wiki
Invasion is the seventh episode of Spartan Ops. It was released on January 28, 2013. In this episode, Captain Lasky confronts Dr. Halsey for her actions, the Infinity is invaded by Promethean Knights, and Sangheili terrorist Jul 'Mdama gets closer to unlocking the secrets of the Librarian.
Roland's hologram rapidly flickers, then settles. The AI looks up at Halsey with an expression of blank obedience.
Two Marines open the cell door, and gesture for Halsey to exit.
Halsey steps out of the cell and is escorted down the hall with them. Fade to black.
Fade in to Lasky's office, where Halsey was previously interrogated. Halsey is escorted inside.
The two Marines look at each other as if suspicious of the order, but agree and step out. Halsey walks to the room's large screen.
The screen activates. Halsey presses several buttons on it and brings up images of Jul 'Mdama.
Halsey examines the sent info on her data pad.
Halsey turns at the mention of John-117 and gasps in shock.
Halsey spends a long moment in shock, but slowly regains her composure. She breathes deeply and looks determinedly ahead.
Roland's avatar flickers, and the AI regains control of himself.
Roland calms down and resumes obedience.
Cut to Mdama's terminal. The Sangheili observes Halsey appearing in it.
Cut to Halsey's room, where she speaks to 'Mdama's image on the screen.
Behind her, Roland splits into two avatars. A flickering weak red Roland is pushed away by a strong green Roland, then is grabbed and swallowed up again. Roland regains control of himself.
Roland snaps his fingers and the comm screen goes black.
Roland opens the office's door. The two Marines return inside, guns raised.
Cut to Captain Lasky, escorted by Marines to re-meet Dr. Halsey.
Halsey walks up to Lasky and slaps him.
Alarms in the hallway go off. Cut to Infinity's hangar. Marines open fire on Promethean Knights that are phasing aboard Infinity.
A Promethean slashes a Marine with its sword arm.
More and more Prometheans rush into the attack. Palmer picks them off with her pistol. A Promethean Knight appears behind Palmer, but she punches it and kills it with a headshot. Once it disintegrates, she returns to picking off those in front of her.
Cut back to Lasky and Halsey in the hallway.
Prometheans fire down the hallway. A Marine is shot and falls backward on top of Halsey. A second Marine in front of Lasky is killed, but he manages to set down the body and take the Marine's shotgun.
Lasky leaps to defend her with an M45 Shotgun. He kicks the Knight standing above her, and blasts it in the chest. Lasky pulls Halsey to safety as the Knight disintegrates.
A third Marine covers for them but is quickly killed. The two hide behind a corner and Lasky speaks the ship's public comm on the wall.
Lasky pumps his shotgun. Promethean Knights flare their skulls at Lasky and Halsey. Cut to black.