Metroids are a deadly race of space-dwelling parasitic organisms that originate from Nintendo's Metroid video game series. They are a regular threat to the bounty hunter Samus Aran and have been deemed dangerous enough for the Galactic Federation to target them for extermination. They feed on the life energy of other creatures to sustain themselves and have proven difficult to kill.
The Metroids were originally a genetically-engineered organism created by the ancient Chozo race as a means of destroying the deadly X Parasite. They were successful in fighting off the X and drove it to near extinction, but the creatures proved to be too difficult to control and the Chozo were forced to abandon their colony on SR388. The Metroids left on SR388 quickly rose to the top of the planet's food chain.
The Metroids would one day be discovered by the Galactic Federation who captured a number of specimens for scientific research, but the frigate carrying the creatures was attacked by a Space Pirate raiding party. The Space Pirates discovered the Metroids and saw that they possessed significant military potential. Since this incident, the Pirates have focused much of their efforts into using Metroid genes as material for developing biological weapons or using Metroid specimens as organic batteries. Because Metroids are capable of absorbing energy so efficiently, the Space Pirates would often try to use them as living batteries to power machinery on several of their bases.
Because of the Space Pirates' interference, Metroids have spread beyond the boundaries of SR388 and have appeared on a number of other planets across the galaxy. The Galactic Federation have deemed the Metroid infestation a serious threat to galactic security and have called for a galaxy-wide eradication of all Metroids. The bounty hunter Samus Aran has been regularly called upon by the GF to investigate Metroid hot-spots and to destroy any parasites she encounters. Her mission to hunt down Metroids has taken her to many worlds, including SR388, Zebes, Tallon IV and Aether. Metroids have proven to be quite adaptable and have grown in different ways depending on the environments of the planets they've been discovered on.
Metroid life cycleEdit
- Juvenile Metroid - The most commonly encountered variety of Metroid (pictured above). At their smallest, they are roughly the size of a basketball. Their bodies consist mostly of a translucent, gelatinous membrane through which their sensory organs can be seen. They constantly float through the air and will quickly fly towards potential prey, latching on to their victims with their large mandibles and using a pair of smaller fangs to drain a victim's life energy. It is unknown precisely how this energy-siphoning ability works and, stranger still, the Metroid's fangs don't leave any visible wounds. The more energy a Metroid consumes, the larger its body will become. Since they consume energy, Metroids possess a high resistance to energy-based weaponry. They are vulnerable to extreme cold, however, and Samus Aran has killed many by freezing them with an Ice Beam and then shattering their frozen bodies with concussive missiles.
- Alpha Metroid - The next phase in the life cycle of Metroids from SR388. When Juvenile Metroids grow large enough, they molt and emerge from their juvenile carcasses in this larger, more vicious form. They do not latch on to prey but rather repeatedly ram at them, essentially beating victims into submission. They are still vulnerable to cold-based weaponry and can be shattered with missiles when frozen.
- Gamma Metroid - When an Alpha Metroid advances to its Gamma phase, its body becomes larger and heavier. It develops the ability to strike prey with arcs of electricity. It is vulnerable to missile strikes to its head and back.
- Zeta Metroid - When Metroids molt from their Gamma stage, they become wily bipedal creatures that walk on the ground. They attack by charging prey or by shooting them with organic projectiles. It takes Samus about twenty missiles to kill one of these creatures.
- Omega Metroid - A hulking beast of a Metroid after growing beyond its Zeta phase. It is quite powerful and attacks by ramming, slashing with its claws and firing energy bursts. Samus has only encountered five of these creatures before, four on SR388 that were protecting a Queen Metroid and another years later on the Biologic Space Laboratories Research Station. Like all preceding Metroid types, the Omega type is vulnerable to the Ice Beam followed by missiles.
- Queen Metroid - Omega Metroids of a superior genome are capable of evolving into Queens which, like insect queens, serve the purpose of propogating the Metroid species. Samus faced one such Queen on SR388, which fought back by ramming at Samus and extending its neck to bite her. It could also release bursts of energy and would frequently spawn more Metroid Juveniles to defend her.
Numerous Metroid variants have been encountered on different worlds. The Space Pirates have also conducted numerous experiments on the creatures in order to create the perfect living weapons. The different Metroid sub-types are listed below.
- Mochtroid - Mochtroids are the Space Pirates' first attempt at cloning their own Metroids. They closely resemble standard juvenile Metroids, but only have a single nuclei cluster and cannot latch on to prey. They still can drain energy from victims, but not as rapidly or efficiently. They are also much weaker than true Metroids and are easy to kill with any weapon.
- Tallon Metroid - Juvenile Metroids found on Tallon IV. The Space Pirates had transported a number of Metroids they had raised on Zebes to Tallon and were studying their development in different environmental conditions. They look and act exactly like the Metroids encountered on Zebes and SR388, with a transparent green membrane and the ability to latch onto prey as they absorb their energy. Tallon Metroids were also encountered on Aether after the Space Pirates relocated their research there. Their membranes were of a red coloration but they otherwise behaved the same. Like previously encountered Metroids, they were vulnerable to cold-based weaponry.
- Hunter Metroid - Hunters are Tallon Metroids that have grown to an adolescent stage. Their bodies grow to twice the height of a Juvenile with longer mandibles and the addition of two long tentacles that can strike prey from a distance and absorb their energy. Hunter Metroids also like to ram enemies. They are still vulnerable to Ice Beam followed by missiles.
- Fission Metroid - Fission Metroids are Tallon Metroids mutated by exposure to pure Phazon. When one of these creatures is struck by any weapon, they will split into two Metroids. The split creatures will be one of four colours: yellow, purple, red and blue. The different colours indicate what weapon that Metroid is vulnerable to. Yellow: Power Beam. Purple: Wave Beam. Red: Plasma Beam. Blue: Ice Beam. Like with other Metroids, Samus can use Morph Ball Bombs to dislodge a Metroid that latches on to her. Power Bombs are also very useful when surrounded by multiple Fission Metroids since they can kill any colour Fission instantly and have a wide blast radius.
- Dark Metroid - Dark Metroids are Tallon Metroids that have been possessed by the Ing. They look distinctly different from other Metroids, having no transparent epidermis but a thick, dark hide. They also have a clear optical organ. They attack by latching on to prey as with other juvenile Metroids. Their resilience to standard weaponry is increased, but they inherit the Ing's vulnerability to the Light Beam. They can also still be frozen with the Dark Beam and then shattered with missiles.
- Infant Tallon Metroid - Tiny newborn Tallon Metroids found in a Space Pirate research facility on Aether. These underdeveloped creatures are not yet able to absorb energy from other creatures and can only defend themselves by ramming enemies. Their attacks are weak and they can be easily killed with any weapon. However, exposure to Phazon radiation will cause the infants to immediately grow into full-sized Tallon Metroids.
- ''Phazon Metroid - Tallon Metroids that have been created by the Space Pirates by infusing Metroid cocoons with Phazon radiation. The mutagenic properties of Phazon resulted in the birth of these deadly creatures. The Metroid's epidermis glows with Phazon energy. These creatures are stronger than other juvenile Metroids and can even pick up Samus if she's in Morph Ball mode. As well as there energy-siphoning ability, Phazon Metroids are capable of shifting out of normal spacetime, becoming intangible. As with other Metroid types, they are vulnerable to cold.
- Miniroids - Infantile Phazon Metroids. They do not yet possess the capabilities of energy absorption or phase-shifting and are mostly harmless. They gather in large clusters for protection and do not bother to attack other creatures, remaining docile until they mature into their deadly adult forms.
- Hopping Metroid - A bizarre hybrid of Metroid and Hopper heavily mutated by Phazon. It is unknown exactly how this mutation occurred. These Metroids do not fly like other Metroid types, instead walking on four spindly legs. When enemies approach, they will leap toward them and slash at them with their razor-sharp forelegs or spit globules of acidic venom. They are also capable of generating small Phazon shockwaves.
- Metroid Hatcher - A large creature with an oval-shaped body and four long tentacles that it uses to leech away the life energy of its prey. Its body is protected by a Phazite shell and it continuously spawns Phazon Metroids. Samus faces three of these beasts throughout the course of Metroid Prime 3: Corruption and kills them by ripping off their tentacles with her Grapple Beam.
- Unfreezable Metroid - A genetically-engineered Metroid variant created by the Galactic Federation as the ultimate bio-weapon. As the name implies, these Metroids were genetically augmented to withstand cold, the mortal weakness of the Metroid species. Aside from the overly-destructive Power Bombs, no weapon could harm these creatures.