Poltergeist III

Poltergeist III (1988)

Ending / spoiler

Tangina sacrifices herself, so that Caroline, Bruce and Donna can come back after explaining to Kane that she too has the power to lead them into the light and more knowledge than Caroline. Bruce, Donna and Caroline are brought back, but Caroline never shows her face due to it being a double (Heather O'Rourke died before that scene was filmed). After Pat says "she saved us," referring to Tangina sacrificing herself, the screen cuts to the building where lightning strikes it and you hear Kane's laughter as it does so. No explanation is given to why this happened - it could be either that Tangina couldn't fulfill sending them into the light, or to show that they will never leave Caroline alone.