Death ray

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Death ray attached to Mothership Zeta
Gametitle-FO3 MZ.png
Gametitle-FO3 MZ.png

The death ray is a gigantic alien ray gun that is seen to be attached to the underside of Mothership Zeta. The death ray appears to be the mothership's main offensive weapon, and can be used to great effect. The Lone Wanderer gets the chance to use the death ray on an unsuspecting planet Earth, and is later forced to destroy another alien enemy ship with the death ray, after the opposing ship begins to attack the hijacked Mothership Zeta.


The Lone Wanderer first encounters the death ray when they reach the observation area of the ship. A giant alien head will appear as a holographic display, in which it will attempt speech towards the infiltrator. After a while, a loud noise will be heard, and if one looks down, they will be able to see a large beam cross the see-through floor.

Shortly after these events, the quest This Galaxy Ain't Big Enough will begin, and the destruction of the death ray will become the Lone Wanderer's main objective.

Use of the death ray

  • Shields: Most of the ship's energy is dispensed into the ship's shields, giving extra protection in return for the weakening of the ship's death ray.
  • Intermediate: The ship's energy is dispensed equally among both the shields and the death ray; this is the initial stance, and remains as such until manually changed.
  • Powerful ray: The ship's energy is diverted nearly entirely into the death ray, severely weakening the ship's shields, in exchange for maximum death ray power.

The options are, respectively, from the right to the left on the console. Use the button in the middle to fire, in which the death ray will take roughly five seconds to charge each time, with its ability to fire being shown through the button lighting up and then spinning.


  • The Lone Wanderer has an opportunity to attack the planet Earth with the death ray, should they so choose. After the room with the generator nest is cleared out, the death ray can then be configured to aim at the planet Earth near Algonquin Provincial Park in Ontario, Canada. The explosion spans around 350 miles, or 550 kilometers (past Detroit or Cleveland). The controls on the right console change where the death ray aims, and the right-hand control on the left console fires the death ray. Interestingly enough, no negative Karma is achieved for performing such an atrocity.


Mothership Zeta's death ray appears in the Fallout 3 add-on Mothership Zeta, and is used in the quest This Galaxy Ain't Big Enough...