Zelda Rubinstein (May 28, 1933 – January 27, 2010) was an American (United States) actress and human rights activist, best known as eccentric medium (medium (spirituality)) Tangina Barrons in the movie Poltergeist (Poltergeist (film)) (1982) and its sequels, Poltergeist II: The Other Side (1986), and Poltergeist III (1988). She also made guest appearances in the TV spin-off Poltergeist: The Legacy (1996), as a seer, Christina. Rubinstein was also known for her outspoken activism for little people (Dwarfism) and her early participation in the fight against HIV/AIDS.