Alastair

 Alastair es un personatje que va apareixer en la Temporada 4 de la serie de Televisio Supernatural ("Sobrenatural" en Espanya), interpretat per dos actors Mark Rolston y Christopher Heyerdahl.

Alastair és un dimoni d'ulls blancs responsables de torturar les ànimes humanes a l'infern. Ell és tingut en alta estima per molts dels seus companys dimonis. Posseeix un ampli coneixement i la consciència de l'univers, que té coneixement ocult, l'ús dels encanteris llançats en Enoquià i rituals.

Alastair inicialment era immune a les capacitats psíquiques de Sam, encara que, irònicament, ell és finalment assassinat per ell. La seva durabilitat sembla superior a la de la majoria dels dimonis, com el ganivet de Ruby, una arma que pot matar els dimonis, el pot danyar enormement però mai podria destruir-lo.

Com un torturador, és un interrogador expert. En aquest sentit, segons Castiel, que tenia una voluntat excepcionalment forta, el que li permet mantenir-se a si mateix mentre era torturat. Meg era un aprenent d'ell abans de la seva mort. Ell va torturar tant a n'en Dean i en John Winchester, i en ambdós casos es va oferir a posar fi a la tortura si es tornarien propis torturadors. Alastair revela que el primer segell va ser trencat quan Dean va acceptar aquesta oferta.

També pot enviar un àngel al Cel per expulsar-lo de la seva embarcació. Alastair ha demostrat ser resistent a la potència de l'exorcisme d'un àngel . Ell posseeix el coneixement dels quatre genets de l'Apocalipsi i ha demostrat poder per aclaparar a una parca.

Alastair is a White-Eyed Demon responsible for torturing human souls in Hell. 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 , although, ironically, he is eventually killed by them.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.
As a torturer, he is an expert interrogator In that regard, according to Castiel, he had an exceptionally strong will, allowing him to sustain himself while being tortured. Meg was an apprentice of him before his death. He tortured both Dean and John Winchester, and in both instances offered to end the torment if they would become torturers themselves. Alastair reveals that the first seal was broken when Dean accepted this offer.
He also can send an angel back to Heaven by expelling it from its vessel. Alastair has shown to be resistant to an angel's power of exorcism. He possess knowledge of the Four Horsemen of the Apocalypse and has demonstrated power to overwhelm a reaper.