Lakertyan System

The Lakertyan System was where the planet Lakertya was located.

The Sixth Doctor tried travelling to Lakertyan System with Melanie Bush, but fled the system when he discovered deadly radiation present. His future self later sent him a psychic signal to go to Lakertya regardless of this because he needed to kill off the Nathemus that had been secretly implanted in him by dying in the past before they had a chance to grow, and he came under attack by the Rani with focused beams of radiation fatal to Time Lords, resulting in his regeneration. (AUDIO: The Brink of Death)