Top Definition
The 5th DLC to Fallout 3, taking place on an alien ship as the lone wanderer is abducted by aliens,perhaps adding new weapons and armor.
Person 1:Hey did you here about the new Fallout 3 DLC?

Person 2:Theres already so many of them, why buy another DLC?

Person 1:Well,it's called Mothership Zeta, and it's taking place on an alien ship.

by HeadKrab56 June 20, 2009

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