The Eyes of Silverweed (S03E09)

Silverweed ensnares Fiver in a twisted dreamlike illusion, allowing him to invade Fiver's thoughts and discover the whereabouts of Watership Down for his master, Woundwort. Though Fiver struggles to break free from Silverweed's grip, the enemy manages to uncover that Watership Down lies "in the high hills, near a lone beech tree." Realizing the threat Silverweed poses, Hazel and the others make their way to Darkhaven with plans to capture him. At the same time, Campion and Blackberry share a similar goal, while Granite rises to become Woundwort's new second-in-command after defeating Vervain in a challenge, with Vervain choosing to forfeit against the stronger Granite.