Spherical aliens are red with a head that looks like a winged alien. They are bigger and more ball-shaped than winged aliens, though. They also have several spikes on body, a horn on their head and yellow eyes. The center of the alien has a bright sphere. They resemble mines.
Spherical aliens always moves either vertically or horizontally. In some levels, they move in square shaped path. They are dangerous on contact, but can be killed with one blow from a superstar, a Big Daddy bomb or a neutron bomb.