List of bosses in the Metroid series

Bosses are very powerful enemies that often guard or possess a power-up which Samus Aran must kill to obtain the item. This page is a list of bosses in the entire Metroid series.

Metroid
Kraid and Ridley can be killed in either order, but must both be defeated to access Mother Brain's lair.
 * Kraid - One of two bosses necessary to defeat in order to access region of final boss
 * Ridley - One of two bosses necessary to defeat in order to access region of final boss
 * Mother Brain - Final boss

Metroid: Zero Mission

 * King Worm - Carrier of the Charge Beam upgrade
 * Mua - Grants access to the rest of the area in which it presides
 * Kraid - Carrier of the Speed Boost upgrade
 * Kiru Giru - Grants access to Ridley's Lair
 * Imago - Carrier of the Super Missile upgrade
 * Ridley - Carrier of an Unknown Item, later discovered to be the Gravity Suit
 * Mother Brain - "Final" boss before Samus is shot down during her retreat from Zebes
 * Ruins Test - Returns not only a Power Suit to Samus, but also grants access to the three previously Unknown Items: the Gravity Suit upgrade, the Space Jump and the Plasma Beam.
 * Ridley Robot - True final boss

Removed: Crocomire

Metroid Prime
In the Wii versions of Prime, each boss rewards Samus with an Orange Credit. Any bosses that do not do this are marked with an asterisk.


 * Parasite Queen
 * Hive Mecha
 * Plated Beetle
 * Incinerator Drone
 * Flaahgra
 * Sheegoth
 * Thardus
 * Elite Pirates*
 * Phazon Elite*
 * Omega Pirate
 * Meta Ridley
 * Metroid Prime (2)

Removed: Kraid, IceBoss

Metroid Prime Hunters: First Hunt

 * A green Samus Aran (Holographic projection)

Metroid Prime Hunters

 * Kanden
 * Guardian
 * Spire
 * Weavel
 * Sylux
 * Noxus
 * Trace
 * Cretaphid v1
 * Cretaphid v2
 * Cretaphid v3
 * Cretaphid v4
 * Slench v1
 * Slench v2
 * Slench v3
 * Slench v4
 * Fire Spawn
 * Arctic Spawn
 * Gorea (2)

Metroid Prime 2: Echoes
Except for the Dark Missile Trooper and Caretaker Class Drone, the Wii versions of Echoes reward Purple Credits for each boss killed.


 * Alpha Splinter/Dark Alpha Splinter
 * Alpha Sandigger/Bomb Guardian
 * Jump Guardian
 * Amorbis
 * Dark Missile Trooper
 * Boost Guardian
 * Alpha Blogg
 * Grapple Guardian
 * Chykka
 * Spider Guardian
 * Power Bomb Guardian
 * Caretaker Class Drone
 * Quadraxis
 * Emperor Ing
 * Dark Samus (3)

Removed: Mad AI

Metroid Prime 3: Corruption
All bosses except for the second Berserker Lord and the Mining cannon reward Gold Credits.


 * Berserker Lord (2)
 * Meta Ridley
 * Rundas
 * Korakk Beast
 * Mogenar
 * Steamlord (3)
 * Defense Drone
 * Ghor
 * Helios
 * Gandrayda
 * Mining cannon
 * Commander Squad
 * Omega Ridley
 * Metroid Hatcher (3)
 * Dark Samus
 * Aurora Unit 313 (2)

Removed: Crocomire

Metroid II: Return of Samus

 * Alpha Metroid
 * Arachnus
 * Gamma Metroid
 * Zeta Metroid
 * Omega Metroid
 * Queen Metroid

Super Metroid
Super Metroid incorporates sub-bosses, known as Minibosses. A Miniboss is a minor boss. For example, Crocomire is the miniboss of Norfair, as, while he is fought as a boss, he does not unlock one of the statues above Tourian. Minibosses are marked with an asterisk (*):


 * Ridley
 * Torizo*
 * Spore Spawn*
 * Kraid
 * Crocomire*
 * Phantoon
 * Botwoon*
 * Draygon
 * Gold Torizo*
 * Ridley (full length battle)
 * Mother Brain (2)

Metroid: Other M

 * Brug Mass
 * Fune and Nahime
 * Groganch
 * King Kihunter
 * Mystery Creature
 * Goyagma
 * RB176 Ferrocrusher
 * Rhedogian
 * Vorash
 * Ridley
 * Nightmare
 * Queen Metroid
 * MB
 * Phantoon

Metroid Fusion
Again, asterisks (*) indicate minibosses.


 * Arachnus
 * Core-X
 * Zazabi
 * Serris
 * B.O.X. Security Robot
 * Mega Core-X
 * Human Core-X*
 * Yakuza
 * Nettori
 * Nightmare
 * B.O.X. (second form)
 * Neo-Ridley
 * SA-X
 * Omega Metroid

Metroid Prime Pinball

 * Thardus
 * Omega Pirate
 * Meta Ridley
 * Metroid Prime