Eureka Seven (Cartoon Network)

Renton Thorston (voiced by Johnny Yong Bosch) is an average 14 year old with an uncommon passion for "reffing," a fantastical type of air surfing that involves riding transparent light particles through the sky. But to Renton, his love for reffing is more than just a hobby -- it's the only way to escape the oppressive boredom of his life in Bellforest, where he lives alone with his cantankerous grandfather, Axel (Steve Kramer). Things really take off when a hulking LFO robot (that's short for Light Finding Operation) crash-lands in Renton's backyard and he meets the beautiful and mysterious Eureka (Stephanie Sheh), a fellow reffer who seeks Renton's help in getting her machine back off the ground. Joining up with her band of Gekko State rebels, Renton finally realizes his dream of reffing to his heart's content -- and he gets to do it alongside his idol, Holland Novak (Crispin Freeman).

At once bleak and beautiful, EUREKA SEVEN boasts a complex storyline that's downright hard to process and could be overwhelming for some young viewers. And while the action starts out innocently enough, it doesn't take long for excessive violence and sexual themes to creep in, transforming a seemingly innocent anime into animation that's better left for adults.

Of course, what teen wouldn't be drawn to a colorful animated series with plenty of shape-shifting robots and attractive young people? Kids are bound to want to watch, so parents should proceed with caution.