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He also can send an [[angel]] back to [[Heaven]] by expelling it from its [[vessel]].<ref>[[4.10 Heaven and Hell]]</ref><ref name="four16" /> Alastair has shown to be resistant to an angel's power of [[exorcism]].<ref>[[4.10 Heaven and Hell]]</ref> He possess knowledge of the [[Four Horsemen of the Apocalypse]] and has demonstrated power to overwhelm a [[reaper]].<ref>[[4.15 Death Takes a Holiday]]</ref>
===[[4.09 I Know What You Did Last Summer]]===
Sam and Dean find [[Anna Milton]] hiding in her church. [[Ruby]] appears and tells them to run because a powerful [[demon]] is approaching. Suddenly signs of the demon's approach break out, including a statue of the virgin Mary weeping blood. Alastair arrives. Sam attempts to exorcise him with his powers, but to no effect. Dean fights with Alastair, who asks if Dean recognizes him.