Screw Attack (item)
The Screw Attack made its first appearance in Metroid. In Metroid, the Screw Attack is a Chozo artifact that allows Samus to attack while somersaulting, which would become the basis of Samus's up special in Smash. The Screw Attack upgrade has since appeared in every 2D Metroid game with the same functionality, although it is obtained from a Core-X Parasite instead of an item in Metroid Fusion. The upgrade also appears with a new design in Metroid Prime 2: Echoes and Metroid Prime 3: Corruption, where it allows Samus to perform continuous mid-air jumps.
The item in Smash is derived from the Screw Attack's design in the 2D Metroid games. In Melee, the Screw Attack specifically resembles the item as seen in-game in Super Metroid; later Smash games have updated its appearance to match the item's brighter color palette seen in Metroid: Zero Mission.
The Screw Attack's iconic design, resembling a stylized letter "S", also serves as the symbol for the Metroid series.
In Melee, it can be thrown at an enemy, which forces them to perform the attack. Unlike when using it normally, however, this leaves the victim helpless in the process. When thrown, Screw Attacks can steal KOs, since the distance the character rises after getting hit by it depends on how fast the character is getting launched. If characters are launched from a high percentage and get hit by a Screw Attack, they fly up very quickly while performing the Screw Attack and often cross the blast line for a Star KO.
In Super Smash Bros. Brawl onwards, the Screw Attack is instead a badge item, similar to the Franklin Badge. As a result, it cannot be thrown as in Melee, but allows the user to attack as normal while it is being held; it will eventually fall off, however. A very large portion of the attack from Brawl onwards is interruptible, allowing it to be cancelled into any of the character's attacks. In Smash 4, the Screw Attack has a quirk of removing the character's ability to short hop while it is equipped. It also slightly boosts jump height.
In Super Smash Bros. Melee
In Super Smash Bros. Brawl
In Super Smash Bros. 4
Equipping the Sandshrew, Top Man, Bubbles, or Helirin support spirits will give the player a Screw Attack at a start of a match.
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