There have been a ton of “Buffy the Vampire Slayer” related spin off proposals (a full list can be found here), but none of them came closer to happening than “Buffy the Vampire Slayer: Animated Series”. The series was going to follow the Scooby Gang back in high school (for the first time with Dawn), with most of the cast reprising their roles (sans Sarah Michelle Gellar), and most of the writing team on board to write episodes. The idea seemed solid, but for unknown reasons it never made it to air. Now, almost four years later, the pilot presentation has been leaked online! Watch it, have your friends watch it, with enough views or the right hype, maybe all this time later it will make it to air. Weirder things have happened.
For now, enjoy!