Sentry Beam

Laser Robots are metal, robotic enemies that appear in Super Mario Galaxy. They fight Mario by firing a laser beam at him and cannot be defeated. However, if Mario jumps on their head or shoots Star Bits at them, they will be disabled for a short amount of time. They first appear in the Battlerock Galaxy, again in Bowser Jr.'s Airship Armada, and then later appear in the Toy Time Galaxy.