Poltergeist: The Legacy - Season 4 - Eps 19: Sabbath's End
Kat faces mortal danger when she resumes her friendship with an ailing Miranda. To save Kat, Rachel must find powers from the past, a past she would prefer to forget. For this episode, we learn that Miranda wants to transform herself into Kat - to inhabit Kats body. To live in Kats body. After the opening credits, Kat and Rachel have an argument and Derek tries to persuade Kat to give up magic - she disobeys, obviously. After a ritual between Miranda and Kat, Miranda tricks Kat and Miranda transfers her soul into Kats body - but before she does, Miranda reveals her true self - elderly, dying old women who has been searching for the perfect body to transfer into. Miranda is now in control of Kat.
About Poltergeist: The Legacy

Title: Poltergeist: The Legacy
First Air Date: 1996-04-21
Last Air Date: 1999-11-12
Status: Ended
Rating: 6.1/10 (from 33 votes)
Language: EN
Seasons: 4
Total Episodes: 88
Network: Showtime
Genres: Sci-Fi & Fantasy
Production Companies: Trilogy Entertainment Group
Synopsis
The adventures of the members of a secret society known as the Legacy and their efforts to protect humankind from occult dangers.
Cast

Derek de Lint
Derek Rayne, Ph.D.

Martin Cummins
Nick Boyle

Helen Shaver
Rachel Corrigan, MD

Robbi Chong
Alexandra Moreau

Kristin Lehman