==Characteristics==
Alastair is a [[Demon|White-Eyed Demon]] (with white pupils and irises)<ref>[[4.09 I Know What You Did Last Summer]]</ref> who was at one point human. After being transformed into a demon, he somewhere along the way became responsible for torturing human souls in Hell; his ranking as a torturer remains vague. He is held in high esteem by many of his demon comrades. He possesses an extensive knowledge and awareness of the universe, having occult knowledge, usage of spells cast in [[Enochian]] as well as rituals.
Alastair was initially immune to Sam's psychic abilities <ref>[[4.09 I Know What You Did Last Summer]]</ref>, although, ironically, he is eventually killed by them.<ref name="four16">[[4.16 On the Head of a Pin]]</ref>His durability seems to exceed that of most demons', as Ruby's Knife, a weapon that can kill demons, could greatly damage him but could never destroy him.<ref>[[4.09 I Know What You Did Last Summer]]</ref><ref name="four16" />