1. Season 7- i loved it i cried and i still cry lol it shows the ending of buffy being the only one with slayer duties(not counting Faith) and changing the line of slayers for ever bringing evil at bay and shhow her shere joy of wat she did and how she did with one big battle at the end.
2. Season 6- showing the great power of Willow and how shes lving and carring and geeky sweet but more powerful the osiris. she showed her love for tara. and almost ending the world.
3. season 5- almost showing wat most of us wanted to happen dawn dieing along with her annoying crying. but also shwoing the love buffy had for her fake sister