Doctor Turret is a multi-sectioned turret that fires projectiles from the many guns that spawn on it.
Doctor turret is a tall boss that stretches floor to ceiling covered in guns that rotate.
Doctor turret has a weak spot in the form of a small spinning metal collar. On lower difficulty, destroying this collar deals around 25% damage and causes the turret to re-order its sections. The easiest way to avoid dealing with the many guns that spawn on it is to destroy the collar as soon as it becomes visible.