The Diffusion Beam (ディフュージョンビーム Difyūjon Bīmu?) is the only new beam weapon featured in Metroid: Other M. When a Charge Beam hits a wall or an enemy, it will diffuse into several smaller bursts of energy in a much wider radius, hence the name. This is similar to the Diffusion Missile from Metroid Fusion. When Samus defeats the first encountered FG II-Graham turrets, this upgrade will appear in the form of a tiny, glowing orb. Scanning it gives the name "Details Unknown". Both traits are shared with the Seeker Missile.

Official data[]

Nintendo of Europe press release[]

"Then there's the new weapon, the Diffusion Beam, which will scatter Charge Beams after impact and hit additional enemies."

Official Metroid: Other M Web site[]

"This upgrade adds some serious fireworks to a well-placed Charge Beam. The energy from the shot will scatter around the point of impact, devastating nearby enemies."


"If you fire a Charge Beam, the beam will scatter around the point of impact."

Samus Screen

Samus Screen data[]

"Effect: Charge Beams will scatter after impact.
Controls: Fire a Charge Beam.


  • In Super Smash Bros. Brawl, R.O.B.'s Final Smash is called the Diffusion Beam. However, instead of firing a powerful beam that explodes, R.O.B. fires a short ranged constant stream of red colored lasers for a short time.
  • The Diffusion Beam is the first beam weapon to only have an effect on charged shots.
  • This is the first beam to be acquired in Metroid: Other M.
  • Interestingly enough, Adam does not comment on the Diffusion Beam at all, nor does he give Samus Authorization to use it.