Watership Down (1999)

S3E10 The Spy

Woundwort assigns Spartina the task of ingratiating herself with Hazel and his group, intending for her to spy on them. However, Silverweed quickly uncovers her true mission. Spartina is under pressure; if she fails to return to Darkhaven by the next full moon, Granite has been instructed to eliminate Blackberry.