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===Powers and abilities===
* [[Telekinesis|Telekinetic]]<ref name="four09" />* Can [[Possession|possess]] humans.<ref name="four09" />* Has high resistance to [[Ruby's knife]].<ref name="four09" />
* [[Teleportation]]<ref name="four10" />
* Unaffected by the smiting powers of [[angel]]s.<ref name="four10" />* Can overpower [[angels]],<ref name="four10" /> though he does not possess the power to kill them.<ref name="four16" />
* Superhuman durability.<ref name="four10" /><ref name="four16" />
* The power to telekinetically inflict damage onto humans's hearts with a gesture.<ref name="four10" />
* Can be killed by [[Sam]]'s powers if Sam has recently consumed
===[[4.09 I Know What You Did Last Summer]]===
Alastair leaves [[Hell]] and [[Possession|possesses]] a pediatrician to capture and interrogate [[Anna]]. He follows [[Sam]] and [[Dean]] from Anna's house to the church Anna is hiding at. [[Ruby]] tries to get Sam, Dean, and Anna to leave as quickly as possible to avoid Alastair, but realizes that it is too late when signs of his approach break out, including a statue of the virgin Mary weeping blood. Although she convinces Sam to exorcise Alastair with his powers, they have little effect on Alastair, who uses [[telekinesis]] to fling Sam down the staircase before attacking and
overpowering Dean. He taunts Dean about their "closeness" in Hell, prompting Dean to finally recognize Alastair, even in his [[meatsuit]]. Sam returns to stab Alastair with [[Ruby's knife]], but much to the Winchesters' horror, the [[demon]] does not die. As Alastair pulls the knife out, Sam and Dean flee from him by jumping out the church window and he allows them to escape so that he can use them to lead him to Anna again.
===[[4.10 Heaven and Hell]]===
tells [[Sam]] that Alastair is "practically the Grand Inquisitor" in [[Hell]] and that she is more scared of him than even [[angels]]. She suggests that Sam resume drinking her [[Demon blood|blood]] so that he can exorcise Alastair , but Sam refuses. Later on, Ruby fulfills her part in Sam's plan by letting Alastair find her. Alastair derides her for protecting Anna, an [[angel ]], when she is a [[demon]], and rejects her offer to trade him Anna for the safety of herself, Sam, and [[Dean]] , instead capturing her and torturing her with [[Ruby's knife|her own knife]] to force her to tell him where Anna is. While torturing her, Alastair reveals that he actually vastly prefers Hell to Earth (which he loathes), having only left it because he must deal with "this nasty angel business." Eventually, Ruby leads him and his minions to Anna ; she is unwilling to simply tell him what he wants to know because she knows that he would just kill her afterwards. Alastair and his minions find that [[Castiel]] and [[Uriel]] are also at the site and are about to execute Anna. Dismissing Castiel's warnings that they will be killed if they do not leave , the [[demon]]s fight the angels to stop them from killing Anna. Although Alastair's minions are quickly killed by Uriel, Alastair proves too powerful for Castiel to smite and overpowers the angel. When Dean hits him over the head with a crowbar, Alastair shifts his attentions to him and Sam and launches a [[Telekinesis|telekinetic]] attack on their hearts while chastising Dean about his lost "potential." He tries to intervene when he sees Anna regain her [[grace]], only to get vaporized instead, leaving behind only Ruby's knife. Later, Dean tearfully reveals to Sam that after every day of torture in Hell, Alastair would offer to stop if Dean agreed to torture other souls ; although Dean held out for the first thirty years (three months on Earth), he eventually gave in because he couldn't take it anymore and spent the last ten years of his time there (one month on Earth) torturing other souls under Alastair's instruction.[[File:Alistair with Death's weapon.Jpg|350px|thumb|left|Alastair in his new [[meatsuit]], preparing to break one of [[the 66 Seals]].]]
===[[4.15 Death Takes a Holiday]]===
===[[4.16 On the Head of a Pin]]===
[[File:AlastairKilled.jpg|thumb|right|350px|Alastair is killed by [[Sam]].]]
is captured by [[Castiel]] and [[Uriel]] and imprisoned in a [[devil's trap]], but he refuses to tell them anything about the slain [[angel]]s. [[Dean]] is recruited as an interrogator because he was formerly Alastair's student during his time in [[Hell]]. After extensive torture, Alastair breaks free Uriel having sabotaged the devil's trap to prevent his role in the angelic deaths being revealed. He almost kills Dean, but is stopped by Castiel , who throws [[Ruby's knife ]] and embeds it in Alastair's chest . Alastair pulls the knife out and fights Castiel. He manages to trap him against a pillar, and admits that while he is unable to kill the [[angel ]], he will send him back to [[Heaven]]. Alastair begins to chant, but he is stopped by Sam, who has become strong enough to overpower him with ease. Sam forces Alastair to talk, then kills him via his abilities.
===[[4.18 The Monster at the End of This Book]]===
[[Dean]] reveals that [[Castiel]] has told him about [[Sam]]
torturing and killing Alastair with ease. Dean thinks that this is one of the signs that Sam is going dark-side.
===[[4.20 The Rapture]]===
points out that [[Sam]]'s powers used to be strong enough to kill Alastair but are now not even strong enough to kill a low-level [[demon]].
===[[4.21 When the Levee Breaks]]===
While undergoing forced withdrawal from [[demon blood]], [[Sam]] has several hallucinations, the first of which is Alastair inexplicably returning. Sam
hallucinates that he is strapped down and tortured by Alastair with a knife , but eventually Alastair disappears and Sam realizes that he is hallucinating.
===[[4.22 Lucifer Rising]]===
reveals that not even Alastair had known that she was working undercover for [[Lucifer]] and [[Lilith ]].
===[[6.10 Caged Heat]]===
To prove that she is capable of making [[Crowley]] give into her demands, [[Meg]] reveals that she had apprenticed under Alastair in [[Hell]] like [[Dean]] had, and Dean grudgingly concedes that this means she can make Crowley do whatever she wants. Meg doesn't reveal when she undertook this apprenticeship, but it must have been before Alastair's capture in [[4.15 Death Takes a Holiday]], as he was killed in [[4.16 On the Head of a Pin|the following episode]].
===[[6.20 The Man Who Would Be King]]===
mentions Alastair when listing off those who underestimated the threat the Winchesters pose and paid the price for it.
==Alastair in Lore==