Slaar

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

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

The son of Slaar was Draan who was left orphaned after his fathers death but was adopted into the next of Grand Marshal Falaxyr and he later served the Ice Lord as his adjutant. (NA: GodEngine)

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

Behind the scenes

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