The Cosmic Silverback is the primary antagonist of Dead Ops Arcade, where he serves as the final boss at round 40 in the Tropical Forest arena. He will also appear at the end of a round, usually every five rounds, in an attempt to steal some treasure that spawns at the end of that round. After he roars for the first time during any appearance, the player(s) must keep their distance or they can die upon touching him; note that he roars immediately upon spawning at round 40, where he becomes immediately hostile. He will appear again when the players see their final scores after they all run out of lives, this time crushing the player with the highest score and stealing all of their treasure.
When it appears on a round with an invincibility ring, one can still shoot it and make it shed blood, but not bring it any closer to death.
A player can get a picture of the Cosmic Silverback's face for an emblem.
Unlike the other enemies, the Cosmic Silverback's eyes do not seem to glow.
The Cosmic Silverback is featured on the front of a magazine found in U.S.D.D. and dated July 7th, 1962 entitled "Exposed" with the story "Russians launch first primate into space and it returned a..." with a picture of the Silverback, and below that, the caption says "WHAT THE HELL IS THIS?".
The magazine can also be found in "Five" while using the noclip command.
On the Xbox Live Marketplace, players can buy a Cosmic Silverback costume for their avatar for $4.99.
According to a blog post from Treyarch, before Dead Ops Arcade, the Cosmic Silverback escaped from the map Ascension.