Mister Pück (S02E05)

Ever since the day Aelita set foot in the Hermitage, she has been plagued by increasingly frightening visions. For a few days now, she hasn't been able to sleep a wink. Jeremy suggests going back to the house to put a stop to her nightmares once and for all. Once at the house, Aelita's visions lead her to a strange, familiar-looking plush toy. (Prime Video)