The Bolton and Nutton (ボルトン アンド ナットン Boruton ando Natton) are guard system enemies that appear out of nowhere in Mega Man 3. Once fully assembled, they will track down Mega Man and attempt to collide with him. They can only be damaged after they have fully come together. They appear in Top Man's stage and Spark Man's stage. With the exception of Search Snake, which they are immune to, Bolton and Nuttons can be defeated with any other Special Weapon.
They also appear in the 3rd Wily Tower Stage in Mega Man: The Wily Wars.