Violent sci-fi series raises discussion points for teens.
Sci-fi drama explores the dark side of humans in captivity.
Teen wizard shines in entertaining British sci-fi.
Time travel sci-fi with bloodless violence, tough heroine.
Powerful anime explores mature themes with some gore.
Girl-centered sci-fi series is like a tween-sized Lost.
Sexual violence and fantasy are central to dark sci-fi.
Darker and still violent, this Ben 10 not for the sensitive.
New take on familiar kids' show has lots of noise, action.
Boy hero grows up, but still fighting aliens.
No surprises in 16th battle-heavy installment.
Violence remains, but this one has substance, too.
"Magic beyond belief"? More like unbelievably bad.
Alien-morphing and action -- every boy's dream.
A cultural icon that's lived long and prospered.
Cult vampire series has witty bite and strong role model.
Heroes battle bad guys in campy sci-fi series.
Power Rangers post-Morphin.
Cheesy fantasy violence lacks real consequences.