The Morph Ball, known as Morphing Ball in Super Metroid, is Samus Aran's alternate form. When using the Morph Ball, Samus is transformed into a metallic sphere approximately one meter in diameter. This allows her to travel through tight passages into which she would normally not be able to fit. Using various modular upgrades, its abilities can be extended. Its appearance changes depending on the suit Samus is wearing when it is engaged.
Other creatures and hunters can use systems similar to Samus's Morph Ball.
The Morph Ball made its first appearance in the game Metroid. It is located on a pedestal to the left of where Samus starts the game in Brinstar. It allows Samus to fit into tight spaces and, once the bomb upgrade is acquired, lay bombs.
Metroid: Zero Mission
The Morph Ball reappears in the game Metroid: Zero Mission, a remake of the original Metroid. It is once again located on a pedestal in Brinstar directly to the left of where Samus starts the game. Its role is identical to its role in the previous game, including the use of Bombs after the appropriate upgrade has been found.
Samus is in possession of the Morph Ball at the beginning of Metroid Prime, but she loses it when an explosion causes her to hit the wall of an elevator on Frigate Orpheon. Samus acquires it again after defeating a large group of Beetles and one Plated Beetle in the Ruined Shrine located in the Chozo Ruins.
It functions in the same manner as in previous installments, with the additional Boost Ball and Spider Ball features and the ability to lay Power Bombs after the corresponding upgrades have been acquired.
Metroid Prime Hunters
Samus has possession of the Morph Ball throughout Metroid Prime Hunters.
Samus is also able to use the other bounty hunters' alternate forms, which all function similarly to the Morph Ball.
Metroid Prime 2: Echoes
The Morph Ball functions in the same manner as it did in Metroid Prime, including the use of Bombs, the Boost Ball, the Spider Ball, and Power Bombs. In addition, the Boost Ball can be used in conjunction with the Spider Ball to propel the Morph Ball off of magnetic surfaces.
Metroid Prime 3: Corruption
Once again, Samus possesses the Morph Ball through all the events of Metroid Prime 3: Corruption. In this game, it is upgraded not only by the returning Boost Ball and Spider Ball, but also by a brand new upgrade known as the Hyper Ball.
Metroid II: Return of Samus
Samus has possession of the Morph Ball throughout Metroid II: Return of Samus, and it is once again supplemented by the ability to lay bombs after the upgrade has been found, along with the Spider Ball, which now can be used to climb on the walls and ceiling.
In Super Metroid, Samus loses the Morph Ball along with all of her other upgrades, leaving only the Power Beam. Fortunately, the Morph Ball is on the same pedestal just to the left of the elevator coming into Brinstar as it was during her earlier mission to Zebes. In this game, the Morph Ball can be upgraded by both bombs and the new unlockable Spring Ball, which enables Samus to jump in Morph Ball form. Power Bombs can also be found in this game and once again require the use of Morph Ball mode to be used.
Metroid: Other M
In Metroid: Other M, the Morph Ball, unlike most of Samus' abilities, never has any restrictions placed upon its usage by Adam Malkovich. He does, however, place restrictions on Samus' use of the Morph Ball Bomb and Power Bombs, which once again have to be unlocked. Morph Ball Mode functions as in most other Metroid games, but it can only be activated in third-person mode.
When Samus is injected with a Metroid vaccine at the beginning of Metroid Fusion, she loses all her abilities once again, including the Morph Ball. The Morph Ball is located in the Main Deck and can be obtained by defeating Arachnus X.
The Morph Ball is once again upgraded by the Morph Ball Bomb and the Spring Ball ability, now known as the Jumpball.
Super Smash Bros. for Wii U
It is one of Samus Aran's special moves, which also drops a small bomb for Samus to go a bit higher.
- Morph Ball Bomb - Allows Samus to place a small explosive charge. This is used to clear certain weak obstacles and propel the Morph Ball upwards a short distance.
- Power Bomb - Allows Samus to drop a much more powerful explosive charge, with a greater range. In Metroid Fusion it also draws in X parasites.
- Spider Ball - In Metroid II: Return of Samus the spider ball allows Samus to climb most flat surfaces. In the Metroid Prime series, it can only adhere to magnetic rails.
- Spring Ball - Allows the Morph Ball to jump a short distance.
- Boost Ball - When charged, briefly accelerates the Morph Ball. This can be used to climb half pipe structures. It also allows Samus to jump perpendicularly away from the magnetic rails used by the Spider Ball.
- Hyper Ball - Fires continuous streams of Phazon electricity during Hypermode. The more it is used, the more Phazon is drained. It is obtained after defeating Mogenar in Metroid Prime 3: Corruption.
- Due to limitations in the NES hardware, the unit was unable to portray Samus crawling. The Morph Ball was created to simplify the required animation to the point that the NES could handle it.
- The original Metroid named the Morph Ball "Maru-Mari", which is simply a transliteration of its Japanese name, まるまり marumari. This is derived from the verb 丸まる marumaru, meaning "to roll into a ball."
- The Morph Ball is the first out of any upgrade linearly obtained in the Metroid series.
- Samus probably gets in the form of energy inside the sphere.
- "This small tunnel leads back behind the wall. Width of the opening is approximately 1 meter in diameter." —Scan Data (Metroid Prime)
- "Samus grows small and round like a ball when he gets this Power Item/ Useful when traveling along narrow passageways, it will help him until his energy runs out." Metroid Instruction Booklet, Pg 25
- "This ability allows Samus's suit to curl into a ball form and navigate narrow passageways. (Press twice)." Metroid: Zero Mission Instruction Booklet, Pg 26
- "When Samus rolls into the Morph Ball, the camera will pull back out of the visor view and display a third-person perspective. Using the Control Stick, you can roll the Morph Ball in whichever direction you choose. Bear in mind that gravity will affect the Morph Ball—you'll need to tilt the Control Stick farther while rolling up inclines." Metroid Prime Instruction Booklet, Pg 20
- "As Samus explores, she'll run into many areas that are too small for her to navigate. By pressing the X Button to go into Morph Ball mode, however, she'll gain the power to roll herself up into an armoured ball that can fit in small tunnels and drains. As she finds additional power-ups, she'll expand on the abilities at her disposal while in Morph Ball mode." Metroid Prime 2: Echoes Instruction Booklet, Pg 20
- "If you press the C Button, Samus will roll up into a ball and be able to get through narrow passages, such as air vents and hidden passages. To change back, press the C Button again." Metroid Prime: Trilogy Instruction Booklet, Pg 14, 26, 39
- "You can use the Morphing Ball to make Samus roll into a ball and squeeze into narrow areas." Super Metroid Instruction Booklet, Pg 25
- "Press to go into Morph Ball mode and move around small spaces. Press again to change back." Metroid: Other M Instruction Booklet, Pg 18
- "Use this power to roll into a ball and move through narrow passageways. Press [DOWN] twice on the + Control Pad." Metroid Fusion Instruction Booklet, Pg 38