Series 2: Spark

Season 2: Spark was the second Season implemented into Halo: The Master Chief Collection. The Season debuted on July 14, 2020, with the launch of Halo 3 as part of the collection on Steam and Windows. Although launching alongside Halo 3, the cosmetic unlocks available focus on adding new Skins for Halo: Combat Evolved multiplayer alongside new nameplates. This season was preceded by Season 1: Noble and will be followed by Season 3: Recon with the launch of Halo 3: ODST for PC on September 22, 2020.

Seasonal events and challenges
Season 2 saw the launch of the Challenges feature in The Master Chief Collection. To celebrate the launch of Halo 3, two limited-time challenges were introduced to unlock the Acrophobia Skull and Alliance Nameplate. Additionally, a number of season-long challenges were introduced to earn the gold skins for the Assault Rifle, Shotgun, Pistol and Sniper Rifle alongside XP and rewards.

Season unlocks
The seasonal unlocks for Season 2: Spark take the form of the skins for weapons, vehicles and visors in the multiplayer of Halo: Combat Evolved and nameplates for use in the menus. For The Master Chief Collection, the unlocks have been divided into 10 tiers of ten unlocks each. To progress a tier, all ten unlocks within must be unlocked.

Each unlock slot can be unlocked for, rewarded through the collection's updated rank scheme or the Challenges implemented in the Spark update.