Phazon Overload is an involuntary entry of Hypermode in Metroid Prime 3: Corruption. This state occurs when a Space Pirate enters Hypermode and throws a Phazon grenade at Samus, causing her to involuntarily enter Hypermode. Samus must fire to vent the excess Phazon as a warning appears in her visor, flashing "PHAZON OVERLOAD". She can also enter Phazon Overload by having the Phazon bar fill up to full under regular Corrupted Hypermode, though her visor will not flash any warnings. In both cases, this causes Phazon tentacles appear in the sides of her visor, while alarms blare inside her suit. If she successfully vents the Phazon, the tentacles will be gone and the visor will no longer flash the warning, while the bar will drop to half-full regardless of how much Phazon Samus vents. However, Samus will still be in Corrupted Hypermode, and so must continue to vent if she wants to avoid Terminal Corruption, which will cause an alternate Game Over scene to play, showing a rather disturbing scene depicting Samus transforming into another Dark Samus. If she is using the Morph Ball at the time, Samus does not see Phazon tentacles in her visor, due to her not having a visor at the time, but it does flash repeatedly yellow. Once she is completely corrupted, the screen flashes white, as opposed to the colors fading away to blue and black.
- Interestingly, when Samus first has her first Phazon Overload in Corrupted Pool, she seems to be unstable in movement as she expels Phazon. This does not happen if another overload occurs, and may be a result of her being caught off-guard.
- Also, if Samus is forced under Hypermode by a Phazon Grenade, then she will not lose one full Energy Tank from venting; rather, she will only lose a few units of Energy from the grenade hitting the Power Suit.