Perhaps no one needs to have a guest appearance in the new series than Alyson Hannigan as Buffy's best friend Willow. Their friendship was the glue that kept the Scoobs together, and we know if Willow could help Buffy with anything to do with the new challenges she's facing, the powerful witch would be there in a second.

In every generation there is a chosen one, and Generation Alpha’s has just been announced. 15-year-old American Horror Story and Star Wars: Skeleton Crew actor Ryan Kiera Armstrong will be joining OG Buffy the Vampire Slayer star (and reboot producer) Sarah Michelle Gellar in the series revival Hulu pilot.