Missile

Missiles are an upgrade featured in all Metroid games, making Metroid their debut appearance. Samus can use missiles to unlock certain doors and hurt certain enemies that beams are incapable of harming.

Metroid appearances
In Metroid Prime and Metroid Prime 2: Echoes, missiles can also lock-on to foes.

In Metroid Prime Hunters: First Hunt, missiles do not have their own ammo, but instead use up 10 units of the Power Beam ammo. Additionally, if a second Missile item is collected, the Missile weapon can be charged up for greater effect. A fully charged Missile (in Hunters, this would be called the Super Missile) attack costs 15 ammo.

In the full version of Metroid Prime Hunters the missiles and Power Beam do not share the same ammo, as the Power Beam is unlimited. Instead, missiles work similar to the other Prime games. The missiles are Samus's affinity weapon in Hunters and, when fully charged, they will have a slight homing effect on enemies. This effect only works with Samus, who also gets 5 missiles when she picks up an affinity sphere.

Super Smash Bros. appearances
For the Super Smash Bros., the Missile is Samus's side special move introduced in Super Smash Bros. Melee. Samus fires a missile from the Metroid series that can also home in on opponents by slightly angling themselves as they fly, eventually stopping in midair and exploding. By using the attack like one would a smash attack, Samus instead fires a Super Missile, a larger and more powerful missile that flies directly forward before automatically exploding.

In Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, the Missile's first custom variant is the Relentless Missile, which has Samus fire a slower missile that better homes in on opponents; the Super Missiles are also made slower, and do not have as much range. The second variant is the Turbo Missile, in which Samus fires missiles that hang in the air for a moment before moving, but move faster and can adjust their angle to home in on enemies before taking off; the hanging property also applies to the Super Missiles.

In Super Smash Bros. Ultimate, Dark Samus also has Missile as her side special move.