Digga-Leg

Digg-Legg is a robotic boss appearing in the game Super Mario Galaxy 2. It resembles a smaller Megaleg with its weak spot being on its underside, containing a Power Star. However, it only has two legs and its eyes emanate a red glow. The only way to defeat it is for Mario to drill through the planet from the opposite position of Digg-Legg and strike its underside.