Arm Cannon

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The Arm Cannon is the primary weapon of Samus Aran in the Metroid series. It is a gun of alien design affixed to the right arm of the Chozo Power Suit. The Arm Cannon doubles as a Missile Launcher and can be adapted to other foreign technologies. It can be used to download information at Map Stations.

Beams

The Arm Cannon can play host to a variety of energy beams. In the original "Metroid" and "Metroid II: Return of Samus", the beams are separate weapons that can be switched at Chozo Statues or by recollecting them from their original location. This is continued in "Metroid Prime" and "Metroid Prime 2: Echoes", though the beams can be switched at will. In "Metroid: Zero Mission," "Super Metroid," and "Metroid Fusion," the effects of the beams combine into one.

Grapple Beam

As shown in the Metroid Prime series, the Grapple Beam is not actually a part of Samus's Arm Cannon, but is a unique device on her left arm. In every appearance, the Grappling Beam is used to lock on to special targets (including blocks, hooks, and some enemies); Samus can then swing from the end of the beam to cross large gaps. The Grapple Beam is first found in "Metroid Prime" in Storage Depot B of the Phazon Mines. She retains it to the start of "Metroid Prime 2: Echoes," but it is stolen by the Ing early in the game; Samus must defeat the Grapple Guardian in the Sacrificial Chamber of Dark Tovrus Bog to get it back. In "Super Metroid," the Grappling Beam can be obtained from a Chozo Statue in Norfair shortly after killing Crocomire.