Cult Fix’s 15 preview teasers for the seventh episode of Merlin Series 4, The Secret Sharer.

• Morgana is quickly nursed back to health and this time targets Gaius
• There’s more bedroom antics involving Merlin and Arthur
• “Gaius condemned himself. There’s no more to be said!”
• Arthur makes another bad decision. He should really stop listening to his uncle
• “I’ve had my heart broken enough already today, I don’t want to lose another friend”
• Agravaine is caught red handed… and so is Merlin
• “I am as disappointed as you sire. Someone so close, so trusted. And it’s not merely the discovery that he was a sorcerer…”
• Poor old Gaius is interrogated…and tortured
• “Get on with it Morgana. Whatever you want to do, just do it now. I’m not afraid to die”
• Gaius gets to use magic, though it doesn’t do him much good
• Gwaine finally gets some decent action as he and Merlin go on a mission
• There’s a last minute switching of sides
• “Not only do I know who Emrys is, I know exactly where he is”
• Someone else learns Merlin’s secret, but it’s not who you think
• “He is the most powerful sorcerer who has ever lived…His name is… Merlin”

It airs Saturday at 8.20pm on BBC1.