Shadow

In which Riley still feels unappreciated, Joyce has a tumour, Glory gets her mojo working, and Buffy battles a giant snake.

Official back-of-box synopsis:

In an attempt to protect her sister Dawn from danger, Buffy must face an evil force that has been called by Glory to find 'the Key'. Meanwhile, Buffy's mother must undergo more medical tests.

From the old WB Buffy website:

BUFFY MAY HAVE MET HER MATCH - In order to protect her sister Dawn, Buffy must face a horrible beast that has been conjured by the powerful demon Glory to help seek out "The Key."

Cast:

• Sarah Michelle Gellar as Buffy
• Alyson Hannigan as Willow
• Nicholas Brendon as Xander
  

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• Anthony Stewart Head as Giles
• Kristine Sutherland as Joyce
• James Marsters as Spike
• Emma Caulfield as Anya
• Marc Blucas as Riley
• Amber Benson as Tara
• Megan Gray as Sandy
• Michelle Trachtenberg as Dawn
• Charlie Weber as Ben
• Clare Kramer as Glory
• Kevin Weisman as Dreg
• William Forward as Dr Isaacs