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Neptune (ネプチューン Nepuchūn?) is one of the first four Stardroids Mega Man must fight in Mega Man V for the Game Boy. He's an aquatic Robot Master with a half-human, half-fish appearance. His weapon is Salt Water, a fluid with substances that can corrode metal.


Neptune leaps and jumps high into the air, directly to the other side of the field. This can be avoided by simply sliding below him when he leaps, then attacking when he leaps again or jumps. Neptune then uses one of two attacks depending on Mega Man's distance from him.

If Mega Man is close to Neptune, he will attack by throwing a blob of Salt Water that splits into three drops of water that, however, deal the same damage the big blob deals. This is very easily avoided by getting out of the way. If Mega Man is far from Neptune, he will start jumping several times to cause an earthquake that makes several salty water drops fall from the ceiling. The player has to avoid it by moving out of the drops' way and being careful as Mega Man's mobility decreases while the earthquake is occuring.

He is always vulnerable to attacks, but the player should make sure to avoid his attacks before shooting. His weakness is the Spark Chaser, which can hit him wherever he is, while having no disadvantages against him. However, it can be only used on him in the rematch against him in the Wily Star. It takes him out in seven hits and hits him twice if it runs through him all three times that it moves.


Mega Man & Bass CD data


Stage enemies

Neptune mug

Neptune's Stage Selected Screen in Mega Man V.

Enemies in Neptune's stage:

Damage Data Chart

Amount of damage in units that Neptune receives from each Special Weapon from Mega Man V.

Mega Man V

Mega Buster/Arm Grab Buster Bubble Bomb Photon Missile Electric Shock Black Hole Deep Digger Break Dash Salt Water Spark Chaser Tango
1:3 0 1 2 1 0 -- 1 0 3 1

Other media



The Stardroids in Rockman Gigamix, with Neptune on the bottom right.

In the manga Rockman Gigamix, the Stardroids are powerful space robots that are attacking Earth, destroying several robots in the process. Neptune defeated Knight Man[1], but was eventually destroyed in an outer space fight with Shadow Man, who forced him back down to Earth and caused him to burn up reentering the atmosphere.

Mega Man (Archie Comics)

Neptune and the other Stardroids are the "offspring" of Ra Moon, who attempted to prepare the Earth for their arrival but was destroyed by Mega Man before it could accomplish its task.


  • Neptune is an aquatic robot named after the planet Neptune, which is named after the Roman god of the sea of the same name. The latter namesake is the likely inspiration for Neptune's fish-like appearance.


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