Series 9

Series 9 is the ninth series update for Halo: The Master Chief Collection, planned for release on August 31, 2022.

The series is the first to be released under the "Series" nomenclature; all MCC updates released between late 2019 and 2021 were done so under the "Season" structure, though due to issues meeting the original development schedule updates were slowed down and the terminology changed. Early on in the support life cycle of the collection, a Season 9 update was planned for release in 2021, though was ultimately pushed back and cancelled due to issues in development (alongside a hypothetical Season 10). As such, Series 9 contains much of the content developed for The Master Chief Collection originally slated for the original Series 9 update. The change in Season terminology has also seen rebranded as Spartan Points.

Halo: The Master Chief Collection

 * Various user interface improvements
 * Seasons rebranded as Series
 * rebranded as
 * Moa statues added into Halo: Reach and Halo 3: ODST campaigns
 * Post-match Poses added into all Halo games, except for Halo 3: ODST
 * In-game subtitles added into Halo 3, Halo 3: ODST, and Halo: Reach.

Halo 2: Anniversary

 * Five new multiplayer Spartan armor sets; 1 canon and 4 Fractures. Each armour theme has two variants.
 * Breach
 * Bioroid
 * Megaframe
 * Trooper
 * Panzerdoll
 * Forge improvements;
 * Bake lighting function changed from a single button click to a hold option, allowing switching from Monitor from player mode to be less annoying (similarly to the functions of the Forge mode in Halo 5: Guardians).
 * Various bug fixes

Halo: Reach

 * Forge improvements;
 * Object duplication added, in a similar fashion to the feature introduced in Halo 4
 * Reset object orientation hotkey added, similar to the feature introduced in Halo 4
 * Delete by palette/delete everything options added
 * Location name marker options added to Reach forge, similar to the feature introduced in Halo 5: Guardians. 256 names are available to select based on those present across Halo: Reach existing maps, though the feature is only available for use on Forge World and Tempest.
 * Several vehicles have been added to the Forge palette on Tempest.
 * Elites can now pilot the Sabre.
 * Space fighter orientation now appears identically for hosts and non-hosts
 * Various bug fixes
 * Halo: Reach Editing Kit released
 * Bandana and Acrophobia skulls added

Halo 4

 * Forge improvements;
 * Bake lighting single-button press functionally added, the same as Halo 2: Anniversary's noted above.
 * Subtitles for Sangheili dialogues added into Spartan Ops.