This article is within the scope of the Fallout 3 locations project. This project is dedicated to standardizing Fallout 3 location articles. If you want to participate, please check the project page.
The Bridge is a twin deck area open broad floor to ceiling. Mothership Zeta that serves as the ships main control room. Several aliens reside here along with the alien captain.
Mothership Zeta's Bridge consists of a several distinct areas or compartments.
An entry compartment contains
a workbench to the extreme rear
a transporter to the Capital Wasteland (only functions after the quest is completed)
a stasis unit (alien "bed") on the left (port) side of the compartment
a door connecting this compartment with the rest of the bridge.
A "captain's compartment", immediately forward of the entry compartment, contains
a transporter to the engineering section on the left (port) side
a healing arch on the right (starboard) side
doors on the fore and aft sides of the compartment.
The central portion of the bridge contains
a door on the left hand side after you first walk through the doorway into the bridge. It is through this door that Toshiro Kago will enter if he's still alive.
the captain's chair toward the front of this area. Before it is a button to fire the death ray and (to the left of that button) three other buttons to adjust the ship's shields.
four generator-reset buttons, two on either side of the main bridge compartment. A holographic image appears above a button if that button needs to be re-set.
a death ray aiming workstation (The player cannot operate it, but Sally manages to do so.) to the left of the captain's chair; and
assorted nonworking workstations in two slightly lowered areas behind the captains chair.
A forward observation area is located below and forward of the main bridge area (reached by stairs on either side).
The Death Ray can still be fired and the shields adjusted after the completion of the add-on storyline.
When looking out the window on the bridge you will notice 3 buttons to the left of the main button that fires the Death Ray in the quest This Galaxy Ain't Big Enough.... The further to the left you go, the higher the shield power goes up, but this also lowers the power of the Death Ray, and vice versa. The best strategy to destroy the enemy alien ship is to alternate between pushing the button on the right (providing maximum power to the Death Ray) to shoot, and pushing the button on the left (powering up the shield to max) when being fired upon by the enemy ship. That should make short work of the enemy ship, and thus end the final quest of the expansion.