Merlin
Season 1, Episode 12: To Kill the King
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Gwen's father, Tom, helps a sorcerer named Tauren turn lead into gold using a magic stone. As Tauren escapes, Tom is caught and will await trial. Whilst looking for Gwen, Morgana finds the magic stone, and Merlin can sense it. When Tom is killed by Uther, Morgana is out for revenge on Uther.
All Episodes - Season 1
Episode 1
The Dragon's Call
Episode 2
Valiant
Episode 3
The Mark of Nimueh
Episode 4
The Poisoned Chalice
Episode 5
Lancelot
Episode 6
A Remedy to Cure All Ills
Episode 7
The Gates of Avalon
Episode 8
The Beginning of the End
Episode 9
Excalibur
Episode 10
The Moment of Truth
Episode 11
The Labyrinth of Gedref
Episode 12
To Kill the King
Episode 13
Le Morte d'Arthur