Nothing is known about Mason's life prior to or as the outbreak began, except that he served as a member of the California Army National Guard.
When zombies begin attacking the military base, Mason, along with Johnson and Jones, ambush Alicia and Chris in the parking garage and steal their vehicle. The status and fate of Mason remains unknown, as it is unclear if they were able to escape in time without being overrun by the zombies.
This list shows the victims Mason has killed:
- Possibly numerous counts of zombies and unnamed people
- While uncredited and without speaking lines, this character's name is revealed by the name tag on his uniform.