Mandy und die Mächte des Bösen S01E07 - Feste feiern, bis wir fallen

Through a spell, Selcan manages to travel through time to the Halloween party. Here she witnesses what happened to Mandy and Jessie: the two of them opened the night garden themselves. Jessie was possessed by a demon and fell off a parapet with Mandy. Back in the present, everyone can remember the events again.