Watch a sneak peek from Saturday’s Merlin episode “The Dark Tower,” in which Morgana sets up a trap for Gwen and the knights.

The video shows Morgana summoning snakes from the grass, which attack Gwen and the knights as they are riding through the forest. And trying to escape, Gwen ends up riding straight into Morgana’s arms!

The episode description for “The Dark Tower” reads:

When Gwen is snatched from Camelot without warning, Merlin knows there can be only one person responsible: Morgana. Arthur is determined to rescue his queen, but it will not be easy; she is locked in the Dark Tower, a place that haunts the dreams of men. Arthur and his knights must embark on a quest like no other, battling through a landscape riddled with hidden dangers, perilous obstacles and magical beings. As they near their goal, Merlin’s sense of dread reaches breaking point. What twisted game is Morgana playing? And more importantly, just what is the final test that awaits them in the tower?

You can also see the promo and images released for the episode, as well as read 10 intriguing lines of dialogue.

While you wait for Saturday, why don’t you check out the Merlin Facebook Game if you haven’t already? Hypable has an exclusive interview with the creators and a review of the game, too!

Merlin 5×06 “The Dark Tower” airs Saturday at 20:05 on BBC One.