» SavedByTheBell

Mario Lopez is a busy man.

Between his ongoing hosting duties for 'Extra' and 'America's Best Dance Crew', as well as his recurring guest role as a plastic surgeon on 'Nip/Tuck,' you wouldn't think he'd have enough time to catch his breath, much less use it to give us the inside scoop on all his upcoming projects.

Yet that's just what he did when AOL TV caught up to him recently, telling us all about the 'Saved By the Bell' reunion, the new children's book he co-wrote with his sister and his ongoing search for a new canine friend. So check out what he had to say, but watch out: you may get exhausted just reading about his amazing schedule.

The Zack Attack is back! Alas, it was for one night only.

Last night, Mark-Paul Gosselaar surprised Jimmy Fallon on 'Late Night' by showing up dressed as Zack Morris from 'Saved By the Bell' -- complete with giant mobile phone. Fallon's been obsessed with putting together a 'Saved By the Bell' reunion, and Gosselaar (who now stars in TNT's 'Raising the Bar') gamely agreed to participate -- if Fallon can get everybody else on board.

It got us thinking about which of our favorite '90s sitcoms need to hold reunions, like, yesterday. 'The Today Show' already hosted a 'Cosby Show' reunion, but here are some more meet-back-ups we really, really want to see:

Beverly Hills, 90210 ... 21 Jump Street ... The Facts of Life ... see where they rank on our list.

The bad news? Summer's almost over and it's nearly time for school again.

The good news? We've got just the thing to ease you into back-to-school mode: Our countdown of TV's 21 best school shows ever.

So sharpen your No. 2 pencil and dive in to see which series just make the grade and which ones are at the top of the class.

Can you make the grade?

The beginning of fall will always mean one thing -- back-to-school season.

And in honor of this special time of year, we present you with a pop quiz all about TV schools.

Where did Felicity go to college? Was a baby ever born at Bayside High? Please keep your eyes on your own paper. Pencils out ... you may begin.

How much do you know about TV sports stars?

Always picked last in gym class? That's OK. You don't need to be a jock to ace this game.

You do, however, need some serious TV skills to answer which position Tim Riggins plays, which sport was popular on Caprica or which Simpsons' sibling acted as goalie.

Think you're ready? Then bring it on.