Defy hostile alien abductors and fight your way off of the massive Mothership Zeta, orbiting Earth miles above the Capital Wasteland. Mothership Zeta takes Fallout 3 in an entirely new direction – outer space. Meet new characters and join with them in a desperate bid to escape the aliens’ clutches. To do so, you’ll wield powerful new weapons, like the alien atomizer, alien disintegrator, and drone cannon, and deck yourself out in brand new outfits, like the Gemini-Era spacesuit and even samurai armor.
Mothership Zeta was initially released exclusively as downloadable content on Xbox Live and Games for Windows Live on August 3, 2009. It was made available for PlayStation Store on October 8, 2009. For Xbox 360, download codes for Xbox Live are also available in retail.
Like all add-ons, it is included in the Fallout 3: Game of the Year Edition, released on October 13, 2009 for all platforms.
For Steam users, Mothership Zeta, along with all the other Fallout 3 add-ons, is available, released on July 16, 2010.
In this add-on, the Lone Wanderer finds themselves abducted by extraterrestrials and taken them aboard their alien mothership after stumbling upon the source of an unintelligible radio transmission and exotic piece of alien technology. Orbiting high above the Earth's atmosphere, the Lone Wanderer must adapt to using alien technology to defeat their alien captors... with the help of some fellow abductees, of course.