"Chozo script translated."

This article's name is an unofficial translation from official Japanese media and may not represent the canonical English name, if one exists.
An alternate name from an official source may be required.

This article is about the turrets in Tourian and E.M.M.I. Zones. For other uses, see Cannon (Disambiguation)

Small defense Cannons (砲台?)[1][2] are seen in all appearances of Tourian, in Metroid, Metroid: Zero Mission and Super Metroid. The similar Central Unit Cannons[3] appear in E.M.M.I. Zones in Metroid Dread.


Cannons are affixed to the walls and ceilings of the Zebesian Command Center and fire small projectiles at Samus. These artillery batteries seem to lack targeting systems, as they swivel and shoot in entirely random directions, regardless of who or what is nearby. However, this particular attack pattern makes them somewhat unpredictable and dangerous due to their numbers, especially when accompanied with the infinitely spawning Rinkas.

Samus can safely stand on top of the Cannons' glowing circular bases unless they fire a shot directly upwards at her. Their projectiles, although not terribly damaging, are a great nuisance, as a direct hit will often knock Samus into the lava below, along with being capable of destroying her limited number of Missiles.

Cannons are invulnerable to all of Samus's weapons. They appear to be linked directly to Mother Brain, as the only times they were seen being destroyed were immediately upon the supercomputer's defeat (first form in Super Metroid); the gun barrels on the Cannons explode while their circular cores remain.

These mechanisms can be seen in the Galactic Federation blueprints for the Future Aurora Complex, which is closely modeled after the Zebesian Command Center, as featured in one of Metroid Prime 3: Corruption's preview trailers. The Federation might have intended to add cannons to their Aurora Unit(s), as all the benevolent AUs present in Corruption are seemingly defenseless.

Central Unit Cannon[]

A Central Unit Cannon on the ceiling

The Central Unit Cannon[3], abbreviated as CUCannon,[4] is a cannon that appears in Metroid Dread. Each Central Unit is located in a room with at least one Central Unit Cannon mounted on the walls and/or ceiling. Since the Central Units are implicitly of a similar nature to Mother Brain and also rely on Rinkas for defense, these Central Unit Cannons very closely resemble the Cannons seen in the Zebesian Command Center.

At the start of the battle, the Central Unit Cannons in the room emerge from hatches; for E.M.M.I.-06WB, a fourth cannon emerges after the Central Unit's armor is destroyed. Unlike previous Cannons that only fire in random directions, the Central Unit Cannons actively aim at Samus's current position. The Cannons light up just before firing a bolt that travels in a straight line across the room; both the lights and the bolt are the same color as the associated E.M.M.I.'s armor.[5] Samus must dodge the Central Unit Cannon projectiles, since she cannot destroy them for pickups like Rinkas. When the Central Unit is destroyed, the Central Unit Cannons deactivate and retract back into their hatches.

Similar devices[]

A defense system resembling the Cannon is the Ring Beam Unit encountered in the Galactic Federation's Bioweapon Research Center in Metroid: Other M; however, these mechanisms fire Rinkas instead of bullets. A possible variation of the Ring Beam Units make an appearance during the battle against Aurora Unit 313 in Metroid Prime 3: Corruption which fire harmful energy spheres with slight homing capabilities.


  • In Super Metroid, if the Cannon's fire is shot with a Missile or Super Missile, both shots will extinguish each other.
  • In the original Metroid, after Mother Brain is defeated but before the body dissipates, only the bullets of the Cannons stop appearing. The cannons themselves are only destroyed once the countdown begins.



  1. ^ Victory Techniques for Metroid pg. 174, as translated by Metroid Database
  2. ^ Metroid: Zero Mission ミッション・コンプリートブック [1]
  3. ^ a b As named in the configuration data of Metroid Dread.
  4. ^ "CUCannon" is the model's title in the internal files.
  5. ^ Looygi Bros. "11 Cool Details in Metroid Dread (Part 6)". YouTube. January 16, 2022. Retrieved January 18, 2022.