Buffy the Vampire Slayer - Season 5 Episode 5 -

Buffy's mother continues to be sick and the doctors can't figure out why. Buffy finds a strange orb while on patrol and later the security guard who pointed it out to her shows up in the hospital apparently crazy. Buffy suspects that there's a supernatural reason behind her mother's illness and goes into a spell-induced trance provided by Willow which reveals Dawn fading in and out of reality.