Dream Defenders (2011)

S6E8 Tabula Rasa

In her quest to help Buffy move on from her past life, Willow accidentally unleashes a powerful spell that wipes out the memories of everyone around them. As they grapple with the sudden loss of their identities, Willow must race against time to reverse the spell before their friendships—and Buffy's mission—are completely forgotten. With chaos unfolding, the group must navigate their blank states and rediscover the bonds that once held them together.