Corridor No. 5

Corridor No. 5 is a room in Brinstar in Metroid and Metroid: Zero Mission.

Description
In both appearances, Corridor No. 5 consists of brown rocky terrain, several pits of acid, and Air Holes that spawn Zebs. A Missile Expansion is placed on a structure suspended above an acid pit; this is expected to be the first Missile tank that Samus Aran collects in these games (and, by extension, the entire series). Corridor No. 5 ultimately leads to an Elevator, which will take Samus into the fire zone of Norfair.

In Zero Mission, Corridor No. 5 notably contains the ruins of collapsed pillars, similar to those seen in the background throughout the "brown rock" areas of Brinstar. The Zebs' Air Holes no longer appear as artificial structures and are instead part of the natural terrain. After Samus acquires the first Missile Expansion, she is unable to progress further until she acquires Bombs. As she backtracks to Corridor No. 4, she is ambushed by the Charge Beam Beast. If she fails to kill the creature during an encounter, she will continue to be accosted whenever she passes through Corridor No. 5.

Metroid

 * Reo
 * Skree
 * Zeb
 * Zoomer

Zero Mission

 * Zeb
 * Charge Beam Beast (boss)

Metroid

 * 1 Missile Expansion

Zero Mission

 * 1 Missile Expansion
 * Charge Beam (if the Charge Beam Beast is defeated)