Fifield was a geologist who was a part of the crew of the USCSS Prometheus sent to search for the origins of mankind on LV-223.

Once the Prometheus lands on LV-223 the team (Shaw, Holloway, David, Ford, Jackson, Millburn and Fifield) explores a large artificial structure nearby. Due to a rapid windstorm, the team are forced to return to the Prometheus. Fifield and Millburn however, were unknowingly left behind and had no choice but to stay in the temple until the windstorm calms down.

The two crewmembers soon encounter two Hammerpedes that emerge from the black liquid and proceed to attack Millburn. Fifield uses his utility knife to cut the Hammerpede's head off, his helmet is sprayed with acid and he falls into the Black Liquid. At a later stage his camera reappears outside the Prometheus ship and the crew venture out to investigate, with a seemingly incapacitated Fifield waiting for them. Mutated by the Black Liquid, Fifield slaughters several crew members. His transformation allowed him to survive being run over and shot in the head. Fifield was eventually killed by a flamethrower and crushed by an RT Series Group Transport.

Mutant Fifield was made with a David 8's figure with a sculpted head.