Poltergeist: The Legacy is a Canadian horror television series which ran from 1996 to 1999. The series tells the story of the members of a secret society known as the Legacy and their efforts to protect humankind from occult dangers. Despite bearing the Poltergeist name, there is no real connection between the show and the Poltergeist trilogy aside from the title. Wikipedia
(Season One opening title narration)
Derek Rayne, Ph.D.: Since the beginning of time, mankind has existed between the world of light and the world of darkness. Our secret society has been here forever, protecting others the creatures that inhabit the shadows and the night. Known only to be initiated by our true name: the Legacy.