Here are all the Metroid weapons and items.  I'll include a description and what games it is in.
Missiles- Missiles
Featured in- All
Energy Tank- One of these equals 100% more life.
Featured in-All
Ice Beam- This is a beam weapon that shoots out ice.
Featured in- Metroid, MII, SM, MP
Wave Beam- This is a beam weapon thet shoots out waves of energy.
Featured in- All
Long Beam- This makes your beam weapon go farther.
Featured in- Metroid
Morph Ball- This allows you to morph into a ball.
Featured in- All
Bomb- When your in a ball, you can drop bombs.
Featured in- All
High(Hi) Jump Boots- Allows you to jump higher.
Featured in- Metroid, MII, SM, MF
Screw Attack- When you spin in the air, you can hurt enemies by touching them.
Featured in- Metroid, MII, SM, MF
Varia Suit- This is a stronger suit.
Featured in- All
Spazer-A strong, wide beam.
Featured in- MII, SM
Plasma Beam- A strong, plasma based beam.
Featured in- MII, SM, MF, MP
Spider Ball- When in a ball, you can climb up some walls.
Featured in- MII, MP
Spring Ball- When in a ball, you can jump.
Featured in- MII, SM
Space Jump- When your spinning in the air, you can stay in the air. 
Featured in- MII, SM, MF
Charge Beam- Allows you to charge your weapon and make it stronger.
Featured in- SM, MF, MP
Grappling Beam- A beam that can grapple onto certain points.
Featured in- SM, MP
Gravity Suit- Allows you to walk in water as if your walking on land.
Featured in- SM, MF, MP
Speed Booster- Allows you to run real fast.
Featured in- SM, MF
X- Ray Scope- Allows you to see faults in the walls and ceilings.
Featured in- SM
Diffusion Missiles- A chargeable missile that spreads when it hits something.
Featured in- MF
Ice Missiles- Missiles with a ice base.
Featured in- MF
Power Bombs- These are bombs that are 2 or 10 times stronger.
Featured in- SM, MF, MP
Super Missiles- Very strong missiles.
Featured in- SM, MF, MP
Wide Beam- A wide...beam.
Featured in- MF
Power Beam- The original beam.
Featured in- All
Phazon Beam- The strongest beam in the game.  It's Phazon based beam.
Featured in- MP
Boost Ball- When in a ball, you can go faster.
Featured in- MP
Space Jump Boots- Allows you to do a double jump.
Featured in- MP
Power Suit- The original suit.
Featured in- All
Phazon Suit- A suit that allows you to stay in blue phazon.
Featured in- MP
Combat Visor- The visor that allows you to fight.
Featured in- MP
Scan Visor- The visor that allows you to scan things.
Featured in- MP
Thermal Visor- The visor that allows you to see things with heat on it.
Featured in- MP
X-Ray Visor- Similar to the X-Ray Scope, you can see faults in the wall and enemies in the dark.
Featured in- MP
Wave Buster- A strong wave of electricity.
Featured in- MP
Ice Spreader- The coolest beam combo, this freezes the whole room.
Featured in- MP
Flamethrower- A wave of fire.  Basicly, a flamethrower.
Featured in- MP
Legend
Metroid- Metroid                                  MF- Metroid Fusion
MII- Metroid II: Return of Samus          MP- Metroid Prime
SM- Super Metroid
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