Cult Fix’s 15 preview teasers for the eighth episode of Merlin Series 4, Lamia.

• There’s no evil scheming from Morgana this week, but Agravaine is doing his best to make up for it
• Merlin is appointed ‘Acting Physician’
• “Merlin is right. This is no ordinary illness, there is sorcery at work here”
• Gwen gets a big adventure outside the castle
• “You are not a knight! You are not even a physician. You’re nothing but a servant!”
• Sir Leon and Gwaine get into a sword fight, with one left wounded
• “The Knights are like brothers, yet they fight and quarrel like foes”
• Elyan will never kiss a girl again…but he’s not the only one
• “They took the blood from a **** and mingled it with that of a *******”
• Gwen’s tunic comes in very handy
• “If he doesn’t get some help soon, he’s not going to make it”
• Gwen doesn’t realise how close she is to learning Merlin’s secret
• “You won’t find me such easy prey!”
• Someone falls on a sword, literally
• Who knew Gwen was so tough! Well, Arthur won’t let them hear the end of it

It airs Saturday at 8.15pm on BBC1.