They were able to enter N-Space through a gap between time and space to their own dimension, which allowed them to invade. Their leader, Skaul, along with a group of Unlived, took over a ship and attempted to kill all living beings in the universe. He sought Leela and her people as they were killing his people. He gave the Dalek Time Strategist an ultimatum to help their cause or die, which the Daleks rejected, causing a battle between the two species. Through this battle, the Unlived were able to obtain Dalek weaponry.