M-422A (M422A,M422A?) is a stationary aquatic enemy from Mega Man 4 and Mega Man III. When Mega Man approaches a M-422A, it will move up and down in an attempt to harm him if he passes by them. The M-422A is invincible to Mega Man's attacks. It is found only in Dive Man's stage.
It bears a resemblance to a Metroid from the Metroid Series.