The Auto Defense Turret is an automatic turret that opens fire on any enemy that comes within its range. Samus Aran encounters this turret on the Space Pirates frigate Orpheon and on Tallon IV in Magmoor Caverns at the Monitor Station, the Glacier One base in Phendrana Drifts, and the Phazon Mines. They have a weak casing and can easily be destroyed by a Missile, Super Missile, or Charge Beam shot, and can also be frozen with the Ice Beam, which can stun them momentarily, allowing Samus to shoot them at will. Wave Beam shots can cause them to spin randomly and continuously fire for a few seconds, then explode. They eventually become stronger as Samus gets closer to Metroid Prime, with Mega Turrets replacing them in the Phazon Mines.