Buffy The Vampire Slayer

Buffy the Vampire Slayer - "The Gift" - May 22, 2001

In this fifth season finale, Buffy sacrifices her life to close a demon portal and save the life of her sister Dawn.

How Was It It Special? Buffy died, and apparently stays dead.

Was It Special Enough? Yes. With the series ending its run on the WB Network and moving to UPN, Buffy’s death (however short it would turn out to be) brought the season to a powerful conclusion.

Angel - "You’re Welcome" - February 4, 2004

Cordelia Chase awakens from her coma and helps Angel get back on track to fight evil.

How Was It It Special? Cordelia returns and they show old footage featuring Doyle, a pivotal character who had died in first season.

Was It Special Enough? Yes. The episode showcased a popular character and hearkened back to the beginning, when Angel, Cordelia, and Doyle were the only three characters on the show.

Click on the link for more :

http://scifiwire.com/2009/04/losts-100th-episode.php