Octoper OA (オクトーパーＯＡ Okutōpā OA?) (Octoboss in Mega Man for Game Gear) is a giant octopus robot that appears as the sub-boss in Wave Man's stage, appearing while Mega Man is using the marine bike. It bobs up and down in the water, and can only be damaged in the green core on his forehead. When its face appears, it will shoot energy balls from its mouth. The Octoper OA in the Mega Man Game Gear game is smaller than the one in Mega Man 5 on the NES.