This subject is related to the Black Mesa Incident era.
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X-8973 and R-4913

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X-8973 and R-4913
Function(s) / Belongings
Rank / Occupation

Slave/foot soldiers

  • Charged electrical attack
  • Claws
Physical description


Eye color


Chronological and political information

Black Mesa Incident



X-8973 and R-4913 are the Vortigaunt protagonists of the Half-Life: Decay bonus chapter Xen Attacks that can be unlocked by the player who manages to obtain an A rank on all of the regular missions.[1]


In Xen Attacks, both players play as Vortigaunts, "Drone Subjects" X-8973 and R-4913, two Vortigaunts sent to Earth by Nihilanth. Although short on story, the mission gives some unique insight into the Vortigaunts' role in the Black Mesa Incident as well as new layout information pertaining to the facility, notably expanding the Materials Transport area introduced at the end of Opposing Force.

The mission the Nihilanth has assigned X-8973 and R-4913 is the retrieval of crystals stolen from Xen by the Black Mesa Science Team which uses them for research.[2]

Behind the scenes[edit]

There is also an unlockable Alien Mode that allows the player to play through the normal Half-Life campaign as a Vortigaunt.

List of appearances[edit]

See also[edit]


  1. Versus Books Official Half-Life Perfect Guide
  2. Half-Life: Decay, Xen Attacks - Mission Briefing: Earthlings have stolen valuable materials for their research. Reclaim the stolen crystals.