30 Day SF & Fantasy Challenge Day 28: The Best Young Adult Science Fiction Series

The young adult market continues to deliver a lot of varied and interesting works that drives not just teenagers to reading them but adults as well that are looking for simpler escapism that isn’t always available at works aimed at them. Today, we want to know a range of things, from your first young adult science fiction novel/series to the one that defines the genre for you as well as your favorite.

Bonus Question: Which of these works is the best to avoid that sounded the most promising?