Halo Alpha
Halo Alpha

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This article is about the first campaign level of Halo 5: Guardians. For the Spartan-IV fireteam, see Fireteam Osiris.

Fireteam Osiris is dispatched to recover the UNSC's most wanted criminal: Doctor Catherine Halsey

Osiris is the first level in Halo 5: Guardians and the first to feature Fireteam Osiris.


Fireteam Osiris is dispatched to Kamchatka to retrieve Doctor Halsey from Jul 'Mdama while his Covenant fight the Prometheans.

This section requires expansion.



Fades into Dr. Catherine Halsey in an underground facility on Reach. Cuts to Halsey walking toward a door. As she enters, she places her journal on a nearby table. She proceeds to take out a data storage unit, taking it to a terminal.

  • Halsey: "Spartan Locke… I have spent enough years with ONI to know the truth."

Camera pans to Cortana awaiting transfer, switching over to a smiling Halsey. 

  • Halsey: "Once this is over… after all I have done…"

Halsey proceeds to transfer Cortana into the storage unit.

  • Halsey: "They'll order you to kill us both."

Fade to black

Fades in, panning inside a Pelican over to Spartan Locke's helmet. Cuts to a holographic display depicting multiple catastrophes. The display shows an incoming transmission from Thomas Lasky.

  • Lasky: "Fireteam Osiris, over the last 72 hours, five colonies have experienced…"

The camera shifts and pans up to Jameson Locke's face.

  • Lasky: "...identical events.

Camera shifts to a wide shot of the troop bay, Holly Tanaka fiddles with a Magnum.

  • Lasky: "Massive destruction. Forerunner in origin."

Camera shifts to Olympia Vale and Edward Buck adjusting in their seats. Vale gets up.

  • Lasky: "Dr. Catherine Elizabeth Halsey…"

Camera shifts to view the hologram as it shows off a bust of Halsey.

  • Lasky: "...has managed to contact us.

Camera shifts to Buck smiling, scratching his chin and then becoming serious.

  • Lasky: "She claims to have information on these attacks."

Camera shifts into the center of the hologram, following Tanaka as she hands Vale a Magnum.

Camera shifts to see several waypoints mark themselves along the side of a holographic mountain.

  • Palmer: "Your mission is to insert behind enemy lines, retrieve Halsey and bring her back to Infinity."

Camera shifts, Vale is looking at Palmer's feed.

  • Palmer: "Be advised,"

A holographic figure of Jul 'Mdama forms.

  • Palmer: "Dr. Halsey is accompanied by Covenant Supreme Leader Jul 'Mdama."

Camera focuses on Palmer.

  • Palmer: "If you have the opportunity--"

Camera shifts to view Locke, the holographic form of 'Mdama disappears.

  • Locke: "Understood, Commander."

Camera cuts to behind Locke and Vale.

  • Lasky: "Good luck, Spartan Locke. Infinity out."

The holographic display shuts off

Camera shifts to view Vale looking at a miniature holographic display on her forearm.

  • Vale: "Affirmative."

Camera shifts to Tanaka looking at the display on her forearm, and grabbing her helmet.

  • Tanaka: "Say, before we make this jump, anybody wanna say a few words?"

Buck gets up from his seat and goes to grab his shotgun.

  • Buck: "I figure if God can hear how scared I am, so can everyone else."

Buck cocks the shotgun, and places it on his back.

  • Buck: "Locke, you buying first drink when we're done?"

Camera shifts to Locke.

  • Locke: "You ask, you buy."

Camera shifts to Buck as he laughs and grabs his helmet. Camera shifts back to Locke.

  • Locke: "Fireteam Osiris, the light is green."

Locke hits the rear cargo door release button. Clouds and blue sky can be seen outside the hatch. Camera shifts to Vale putting on her helmet and running to jump off the back of the Pelican, followed by Tanaka who is also putting on her helmet and running. Buck hands Locke his helmet and begins walking to the back. Camera shifts to view Locke and Buck. Buck jumps off the back. Locke puts on his helmet and runs and jumps off the back of the Pelican. Locke begins falling to the ground and catches up with the rest of Osiris.

Cuts to black, "Halo 5: Guardians" appears on screen.

H5G Campaign - BattleOfKamchatka

Fireteam Osiris diving into battle.

Fireteam Osiris continues falling, explosions and Covenant warships on all sides.

  • Locke: Comm check.

A Banshee explodes in front of them.

  • Tanaka: Comms are working fine, Locke!

A structure on a mountain collapses near them, thruster packs are used to adjust course.

  • Locke: Copy that, Tanaka.
  • Buck: Spartan Buck, online and ready.
  • Vale: Spartan Vale, online.

Camera shifts to look at them head on as they approach the ground. Buck pulls into the lead.

  • Locke: Weapons free!

Buck reaches for his Shotgun, Osiris prepares to tuck and roll

  • Buck: Contact!

Osiris roles upon landing, engaging Covenant forces from behind.

This section requires expansion.


Album Cover Soundtrack Song Name Soundtrack Number
Halo 5 Guardian Original Sountrack Cover Halo 5: Guardians Original Soundtrack Light is Green 2
Kamchatka 3
Return to the Fold 4


Art Name Description Value
H5G AchievementArt IntotheFire Into the Fire Complete mission 1 10Gamerscore
H5G AchievementArt YourTeamisYourWeapon Your Team is Your Weapon Command your team of Spartans in Osiris 10Gamerscore
H5G AchievementArt EnemyofmyEnemy Enemy of my Enemy Help the Sangheili General charge the hill in Osiris on Heroic difficulty 10Gamerscore


  • The Sangheili General that Osiris can help for the Enemy of My Enemy achievement is Kitun 'Arach.[1]


Easter Eggs[]


Concept art[]