7) To Kill the King - Merlin (Season 1, Episode 12)

Morgana's connection to dark magic changes her from an ally to an enemy, impacting the relationship between Morgana and Merlin and the larger narrative. Merlin is shocked to find out the lengths Morgana would go to exact revenge on Uther for imprisoning Gwen's father, Tom. The battles Morgana wages between herself and others speak to the ideas of betrayal and ambition, leading to a struggle that rings throughout the series.
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Edited by Abhimanyu Sharma