"An expert in clandestine tradecraft, sabotage and infiltration. He lives with a redacted past and an undercover present, marked by a concealed appearance to hide his identity and maintain anonymity in the field."
Born in Manchester, Simon Riley joined the Special Air Service and spent the majority of his career serving numerous short-term deployments and executing covert assignments in classified locations. He became an expert in clandestine tradecraft, focused on sabotage, ambushes, and infiltrations into denied areas and hazardous environments. Ghost concealed his identity under a hallmark skull figured mask to maintain anonymity in the field.
At one point, Ghost worked in the same unit as Mace.
Price: "Zakhaev's plan is working. The Armistice in Verdansk has officially fallen. It's bloody chaos."
Riley: "Tell me something I don't know."
— Price talking to Ghost in the Season 3 cutscene.
When Al-Qatala released toxic gas within Verdansk, Ghost discovered a chaotic situation where the operators of Armistice have turned against themselves and began targeting each other. He soon requested Price to send him reinforcements he could trust. Riley managed to escape the city and was deployed to a classified location where Price informed him that Zakhaev's plan worked, with the Armistice now officially disbanded. Ghost was assisted during this operation by "Alex", who was sent by Price.
With the release of Title Update 1.12 on December 18th, 2019, most TVs that displayed static in Modern Warfare multiplayer maps, such as Arklov Peak, Rammaza or Tavorsk District, would occasionally show a distorted image of Ghost for a few seconds.
As of Title Update 1.13, on January 22nd, 2020, the giant screens on the multiplayer map Piccadilly would occasionally display an image resembling Ghost's skull face plate.
During Season Two, Ghost could be seen in the background inside the lobbies for the Multiplayer and Special Ops modes.
After Title Update 1.15, on February 25th, 2020, Ghost would follow the players in the lobbies for some time before turning back.
Unlike other SAS operators, Ghost's intro video opens with a black screen rather instead of a white screen.