Phantoon

Phantoon is an ethereal, super-natural, genderless spectre that is both intangible and/or invulnerable to any form of attack, except for its single eye. It is this eye that, when open, serves as its connection to the material world and can be damaged. From four meters tall, to ten times as large as Samus' ship, Phantoon resembles a giant squid with a single eye inside a large mouth. According to Super Metroid 's instruction manual, Phantoon is the ghost of the Wrecked Ship itself.

It feeds off raw energy without directly interfacing with wires or equipment and has only been seen drawn to sources of energy from abandoned ships, such as the Wrecked Ship and Bottle Ship. The spectre also taps into Mother Brain's "vicious brainwaves," meaning that Mother Brain may have some control over it, or Phantoon simply feeds off of her energy as well. Nevertheless, based on its portrayal among the bosses in the Golden Statue, Phantoon is a high ranked Space Pirate.

Super Metroid
"The Wrecked Ship has been shut down by the floating ghost, Phantoon." It absorbs the power from everything throughout the ship, including the internal power of Work Robots, leaving everything dark and inoperable, in order to feed its strength and gluttony. On top of that, its presence appears to bring out the souls of those who died in the crash, converging together and becoming evil spirits known as Coverns.

Shortly after Samus enters its room, several flames will ignite, floating in the center of the room. They'll form a circle and start rotating around before closing in on each other. As they fade away, Phantoon begins to materialize into existence.

Battle
Phantoon has two attacks; the creation of phantom eyes and ramming against Samus. It uses these two attacks in conjunction with its two abilities; becoming intangible and invisible.

It uses its phantom eyes in two ways: shedding a few from its mouth like tears that bounce along the ground, and creating waves of different patterns (circular burst, stalagtite style, crescent). However, phantom eyes can either be destroyed for ammunition, or simply jumped through using the Charge Attack, making even the faster phantom eyes easy to dodge. It's possible for them to drop energy or ammunition.

Phantoon's first ability, intangibility, will be the entire theme of his fight. With its eye closed, it detaches itself from the physical realm, and only when its eye is open can Phantoon be hurt. Whenever the creature gains a physical presence, it can harm Samus on contact. It will float around with intangibility, and drop phantom eyes that bounce along the ground. When Phantoon finally opens its eye, it will create a circular wave of phantom eyes. It may return to this pattern, or suddenly vanish from sight.

Its invisibility is used often as well. After opening its eye, it will disappear, damaged or not. It may either float around while invisible to spawn bouncing phantom eyes, or suddenly appear with its eye open and create a wave of stalagtite phantom eyes. While unnecessary, Phantoon can be tracked with the X-Ray Scope.

When damaged by Missiles or a charged shot from the Ice Beam, Phantoon will behave normally. However, disabling the Ice Beam will not make the ghost disappear, but instead return to floating around erratically with its eye wide open and its gaze locked on Samus, attempting to ram her. On the opposite spectrum, Super Missiles will send Phantoon into a fury. It will vanish, and re-appear at the top of the screen and remain intangible for eight crescent waves of phantom eyes at very high speeds. These waves can be dodged by Samus in three different manners: by using the previously mentioned Charge Attack, by using the Morph Ball and sticking to the bottom corners of the room, though she'll need to be switching from left to right with each corresponding wave, or by jumping forward or backward in the middle of the eyes.

As Phantoon takes more and more damage, its color will gradually shift from green to a hot red-orange. Upon its defeat, its eye will remain looking in the same direction as it begins to fade in and out rapidly, before a series of small explosions erupt across its body. Finally, Phantoon will begin waving around like its entrance, except wider and more violent until it stretches across the entire screen and dissipates.

With Phantoon's presence no longer dominating the energy crystals, power immediately returns to the ship. Lights turn on, both map and save stations begin working, conveyor belts start moving, Metal Doors release, Work Robots return to life, and severed wires start sparking dangerously.

Coverns also vanish from the Wrecked Ship, either from the light, or from being freed of Phantoon's malevolent control. However, the return of the craft's energy releases a variety of creatures that were seemingly dormant or locked away in the ship.

Finally, once the doors became unlocked, water from the lakes surrounding the crashed vessel flooded several rooms inside.

Metroid: Other M
Phantoon returns as the final boss of Metroid: Other M, and has grown in size significantly since its previous appearance.

When Samus returns to the Bottle Ship, and reaches the ascent to the Control Bridge, enemies will begin to spawn from dark, swirling vortexes to hamper her progress. These vortexes are created by Phantoon, who has assumed control of the creatures of the Bottle Ship, and has its eye set on Samus' defeat.

As she finally enters the Control Bridge, a massive tentacle suddenly smashes against the reinforced glass, and smashes into it again, creating thousands of cracks throughout one spot, and breaking off an overhead screen from its support. A gigantic bulbous head rises into view, pulsating visibly and audibly. Its double jaw opens, and a piercing red eye leers at Samus.

Battle
Phantoon wastes no time in raising its bottom half and creating more dark vortexes, summoning its Rage Hands to deal with Samus. It will continue to wail onto the cracked window panes with both tentacles, and summon more in between until it finally smashes through. Alarms start sounding off, oxygen is violenty drained from the room, and Samus remains unaffected, her Gravity Feature keeping her feet steady.

Phantoon now attempts to defeat Samus with its improved phantom eyes. Still like blue eyes in a spiritual flame, they spread minimally and now focus on homing directly in on Samus. While these and Rage Hands distract her, Phantoom moves left to right, tearing more window panes open with its massive jaws.

After the top three window panes are shattered, Phantoon's eye becomes obscured by one of his swirling vortexes, only to suddenly peak through it for a moment by extending its eye out on a pherensile eyestalk. It hides its eye again, and reaches right, smashing through the lower windows with its tentacle, and then repeats the same for the left side. The vortex hiding Phantoon's eye fades, and it unveils the rest of its attacks.

With the windows completely gone, Phantoon sweeps one of its tentacles at a time across the floor in an attempt to hit Samus aside. It will also begin spawning swirling red vortexes on the ground that when stepped in, will burst into a pillar of agony. Finally, it will now shoot lasers from its pupil towards Samus in short bursts with little motion. When Phantoon becomes weak enough, its eye will collapse into the room and become primed for an Overblast, though it is possible that this doesn't happen at all. By performing Overblast, Samus will grab onto its eye and hold on as she's flung around on it, until she finally blasts the eye with a Charge Beam. She jumps off, and Phantoon floats away into space before bursting in a piercing white light and a loud bang.

However, if the Overblast isn't performed, Phantoon will begin to lose control, smashing his own eye into the floor over and over, until holding it up and simply bursting into an orange goo. Phantoon will float away still, but without its eye.

Either way, a Grapple Point floats into the room so Samus can leave.

Powers and abilities
As befits a ghost, Phantoon has the power to turn intangible to avoid attacks, which is done by closing its eye. It can also turn invisible to elude opponents. Offensively, Phantoon has several powers to fight, powers that have been augmented in Other M. Its signature move is to create Phantom Eyes, ghostly eyes shrouded in a blue flame. Phantoon can also create Rage Hands; floating, disembodied hands that serve as extensions of its conciousness and are used to physically attack opponents. Phantoon can create large vortexes of dark energy to damage Samus if she walked too close to them, and can use said vortexes to teleport the bioweapons to fight her. Phantoon seemingly has the ability to control bioforms, as it was able to turn the Bottle Ship's bioweapons against Samus in the postgame events.

Trivia

 * Even though Samus fights Phantoon in a vacuum in Metroid: Other M, sound effects are still played regularly, although sound cannot travel through a vacuum.
 * Phantoon's appearance in Other M is much more organic than its Super Metroid appearance.
 * It is unknown why Phantoon's appearance differs so drastically between games. It may be that its size is directly proportionate to how much energy it has absorbed from the ship it leeches off of. The Wrecked Ship, based on its size, would logically only provide so much, but the Bottle Ship is gigantic, fully operational, and teeming with energy. Another possible explanation is that the Galactic Federation played some sort of role in the creature's return and/or altered appearance, given its presence near the Bottle Ship. It may also have simply been an artistic change.
 * Phantoon's upper body pulsates visibly and audibly like a heart. It may be where it "processes" the energy it absorbs.
 * Concept art from Metroid: Other M depicts Phantoon as the head atop a vaporous humanoid body, with two Phantoonghost.jpgr Rage Hands as its hands. It also depicts Phantoon in its Super Metroid appearance despite it having a different design.
 * The concept art also does not depict Phantoon as massive as it is in game.
 * Furthermore, in the top right, Samus is seen battling Phantoon as if it were Andross from Star Fox.
 * Strangely, Phantoon in Other M uses one if its portals to bring out its eye, even though the eye is clearly attached to the eyestalk connected to the body.
 * In Other M, if Samus finishes off Phantoon with a Power Bomb, its eye may be colored red.
 * Although it may seem like Samus is performing Lethal Strike on Phantoon, it is actually an Overblast, as Phantoon can actually knock Samus off its eye if she delays the shot. Also, Lethal Strike automatically fires, which Samus does not do.
 * Phantoon cannot be fought on Other M 's Hard Mode, as the game ends after the MB battle.
 * Other M has made Phantoon one of the largest bosses Samus has encountered.
 * Phantoon's physical structure is heavily similar to Powamps from Maridia. However, no known connection exists between them.
 * Phantoon's eye in Other M greatly resembles the Eye of Sauron from Lord of the Rings.