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Cole Turner makes his first appearance in the third season ( 2000-1 ) première episode, " The Honeymoon's Over ".
Charmed Ones Phoebe ( Milano ) and Prue ( Shannen Doherty ) run into Assistant District Attorney Cole Turner at the site where they killed a demon, and cover their tracks.
Over the course of the episode, it becomes apparent to the audience that Cole is himself a very powerful demon, pursuing Phoebe romantically and deceiving the sisters as to his true nature in order to finally kill them.
In " Power Outage ", Cole's superiors, the demonic Triad, learn that he may have developed genuine romantic feelings for Phoebe ; Cole responds by killing them, forcing him into hiding.
Meanwhile, the sisters acquire a target in the red-and-black-skinned demon Belthazor ( Michael Bailey Smith ); in " Sleuthing with the Enemy ", the Charmed Ones discovers Cole and Belthazor are one and the same, but when Cole convinces Phoebe that he, being half human, truly loves her, she fakes his death so that her sisters Piper ( Holly Marie Combs ) and Prue will not hunt for him.
When Cole re-emerges, causing a rift between Phoebe and her sisters, he attempts to re-ingratiate himself with his demonic peers, the Brotherhood of the Thorn, as the sisters ' double agent.
When Prue and Piper are both killed following a successful mission by the Source's assassin Shax ( Michael Bailey Smith ) in the season finale " All Hell Breaks Loose ", Cole's begs the Source ( again, Michael Bailey Smith ) to turn back time and prevent the exposure of magic ; the Source agrees on the condition that Phoebe remain in the underworld under his command, though he secretly orders her to be killed.
Phoebe is able to escape, however, due to the presence of Leo Wyatt ( Brian Krause ), the sisters ' " whitelighter " ( a witch's guardian angel ) and Piper's husband.
Shax attacks again after time is reversed, but this time Leo is able to heal Piper, but Prue dies ( marking Doherty's departure from the series ).

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