In the Supernatural episode (Season 10, Episode 3), the central conflict reaches a tipping point as Sam Winchester attempts to cure his brother, Dean, who has been transformed into a demon. Episode Summary

The episode concludes with the successful restoration of Dean’s humanity. However, the victory is bittersweet; while the demon is gone, the remains on Dean’s arm, leaving the Winchesters to face the lingering threat of its dark influence. 10.03 Soul Survivor (transcript) - Super-wiki

Meanwhile, Crowley finds that ruling Hell is "boring" without Dean by his side. He ultimately helps Castiel to ensure the situation with Dean is resolved, primarily for his own interests. Resolution

A weakened Castiel, having regained some of his grace thanks to Crowley, arrives just in time to restrain Dean, allowing Sam to administer the final dose of blood.

Dean eventually manages to escape his restraints, leading to a tense, "slasher-film" style pursuit through the Men of Letters bunker. Sam is forced to choose between killing his brother or finding a way to finish the cure.

[s10e3] Soul Survivor Instant

In the Supernatural episode (Season 10, Episode 3), the central conflict reaches a tipping point as Sam Winchester attempts to cure his brother, Dean, who has been transformed into a demon. Episode Summary

The episode concludes with the successful restoration of Dean’s humanity. However, the victory is bittersweet; while the demon is gone, the remains on Dean’s arm, leaving the Winchesters to face the lingering threat of its dark influence. 10.03 Soul Survivor (transcript) - Super-wiki [S10E3] Soul Survivor

Meanwhile, Crowley finds that ruling Hell is "boring" without Dean by his side. He ultimately helps Castiel to ensure the situation with Dean is resolved, primarily for his own interests. Resolution In the Supernatural episode (Season 10, Episode 3),

A weakened Castiel, having regained some of his grace thanks to Crowley, arrives just in time to restrain Dean, allowing Sam to administer the final dose of blood. Dean eventually manages to escape his restraints, leading

Dean eventually manages to escape his restraints, leading to a tense, "slasher-film" style pursuit through the Men of Letters bunker. Sam is forced to choose between killing his brother or finding a way to finish the cure.