Slaar

Slaar was the leader of a group of Ice Warriors who took over the Moonbase in the 21st century.

Slaar planned to use T-Mat to send seed pods all over Earth. These would deplete oxygen, killing the humans and allowing the Martians to colonise the planet. The plan was defeated by the Second Doctor and Slaar was accidentally killed by one of his warriors' sonic blasts. (TV: The Seeds of Death)

The Keller Machine used the Third Doctor's memory of Slaar to attack him. (TV: The Mind of Evil)

Family
The son of Slaar was Draan, who was left orphaned after his father's death but was adopted into the nest of Grand Marshal Falaxyr. He later served the Ice Lord as his adjutant. (PROSE: GodEngine) Vextyr was a descendant of Slaar's. (AUDIO: Cry of the Vultriss)

Behind the scenes

 * For episodes 1 to 4 of The Seeds of Death, Alan Bennion's dialogue was acted live in the studio. For episodes 5 and 6, Slaar's dialogue was recorded separately, like the rest of the Ice Warrior cast.