The Enfield Haunting (2015)

S2E5 Mister Puck

Title: Mister Puck Plot: When Aelita's vivid dreams and eerie visions become increasingly unnerving, the team decides to investigate their origins at the Hermitage. There, Aelita stumbles upon a doll she instinctively identifies as Mister Pück. Tucked away on the doll is a key leading to a locker at a train station, which holds the heavily coded diary of Franz Hopper. However, Xana intervenes, taking control of Jeremie to prevent them from accessing it. After they manage to shut down the tower, Jeremie regains his composure, and Yumi explains to him why Xana can dominate him but not Ulrich, Aelita, Odd, or herself.