Skeletons (or Spartoi in Ancient Evil) are a type of enemy and power-up that appear in the Call of Duty: Black Ops III and Call of Duty: Black Ops 4 and Call of Duty: Infinite Warfare Zombie modes. They are present in the maps Dead Ops Arcade 2: Cyber's Avengening, Der Eisendrache, Rave in the Redwoods, and The Beast from Beyond. Enemy Skeletons appear in the Room of Fate, wielding a cutlass, where they will chase the players so they don't get to the top and get the Fates.
Skeleton power-ups spawn a skeleton which helps the player instead of attacking the player.
In Der Eisendrache, there's an easter egg that makes it possible to turn all zombies into skeletons by shooting three skulls that are hidden throughout the map. They are also present while doing the main easter egg, during the fight against the Keeper.
In Ancient Evil, they are Enhanced class Zombies named Spartoi and appear as ancient Greek warriors in the underground city of Delphi. They appear to be infused with Prima Materia, showing as crystalline growths throughout their bones. They can only be killed by headshots as any kill without a headshot will cause them collapse in a heap and to resurrect nearby after a short delay. They originated from Perseus' initial venture into Delphi and the initial activation of the Sentinel Artifact.
- The Spartoi in Ancient Evil, as well as their animations (meant to resemble stop-motion) are a homage to the skeleton warriors made by Ray Harryhausen for the 1963 movie Jason and the Argonauts.