In Buffy The Vampire Slayer and Angel, both shows combined began hundreds of different plots, many of which received perfect on-screen resolutions.
That will be the main crux of this article - on-screen. While several of the below points may or may not have been teased out in the comics, this article is specifically referring to what has been addressed in the continuity of Buffy The Vampire Slayer seasons 1 - 7 and Angel seasons 1 - 5.
While that is not to say that the comics and extended lore are not an excellent medium in their own right, there is something special about the filmed and released material that went with the original shows. At times, Buffy The Vampire Slayer was among the greatest television shows released. There were then other times when Angel arguably surpassed it in terms of depth and quality. Both shows introduced a fantastic core of characters, bringing many different walks of life together under one banner.
Both shows also suffered from quality issues throughout their runs. It would be fair to say that both had 'dud' episodes (these will be explored in a future list), yet that is true of almost any show that has ever been released.
These are the stories that the audience were denied a satisfying conclusion to, ranked in order of how badly they were needed!
10. Ms. French's Kids
Natalie French was everything that a school would want in a substitute teacher. She was passionate about what she taught. She was an excellent teacher. The students really liked her. The male students, in particular. The fact that she was a giant Preying Mantis was really just a sidenote, to be honest. The kids were learning and isn't that what's most important?
Her overall plan involved capturing virgin boys and using them to fertilise her eggs, which she had strung up in sacs all around her basement. Naturally, Xander falls for her charms (pheromones) and is taken captive, though he is saved by a combination of Buffy's fighting skills and Giles's research skills - skills that involve recording bat sonar.
All of the eggs in Mrs. French's house are destroyed and the group go about their business, with another (though not the last) failed romance to add to the cards.
In the final shot of the episode, the closet door is slowly closed, but not quickly enough for the audience to miss the opening eggs of some more of Mrs. French's children. Did they survive? Did they escape Sunnydale? Were they living in the school the whole time? To be fair, Sunnydale High had such a mortality rate that it is very possible they could have operated without being noticed for a long time! But still....seems like a fairly large oversight!