With the return of "Mad Men" on the horizon and a host of other shows thriving, we rank our top 25 series.

"Game of Thrones" debuts strong and "Modern Family" retains its place in the top three, but nothing stood in the way of AMC's freshman dramas, "The Killing" and "The Walking Dead," from sharing the spoils of the #1 spot.

"Lost" comes to a close, "Boardwalk Empire" makes its debut, and a pack of zombies invades the rankings. But none of them can take the top spot from an old AMC favorite.

This is the year you get all the answers to those burning questions about Oceanic 815. As "Lost" comes to a conclusion, "The Office" holds strong at number two, followed by the likes of "Breaking Bad," "30 Rock" and "Modern Family."

It may have been two years since "Curb" last aired, but that didn't keep Larry David from blowing the lid off, despite high expectations for a Seinfeld reunion. "True Blood" and "Mad Men" rose while "30 Rock" and "The Office" dropped.

"Lost" had seemingly become sacred. You couldn't say a bad word about it unless you wanted to play victim in a good old-fashioned stoning. As such, the ABC drama hit the top spot, despite the network's decision to axe many other quality shows.

After the writer's strike, we were ready for some laughs. That may explain why two of our top three spots went to "The Office" and "30 Rock." Nah. The real reason they're up top is because they're damn funny.

By the Fall of 2007, "Heroes" had earned our top spot with a fresh mix of suspense and action while faves like "The Office," "Entourage" and "South Park" held steady and a host of great new shows joined the rankings.

The start of 2007 saw a massive shakeup in the industry powerhouses, with Fox's "24" finally taking a tumble. In its place, we finally gave love to "The Wire," the HBO crime drama that flew under the world's (and our) radar for far too long.

Premium programming had really blown up around the middle of the decade. More than ever before, our Power Rankings were heavily populated by HBO programming, with "Entourage," "Deadwood" and "The Sopranos" landing in the Top 10.

In the winter of 2006, Kiefer Sutherland was still on top. His show hadn't yet tipped into over-the-top absurdism and it had the viewership to warrant a top spot, while a remake of an iconic BBC sitcom stormed onto the scene with NBC's "The Office."

It was a great year for Kiefer Sutherland, who managed to snag our top spot despite contending with heavy-hitters like "The Sopranos," "Arrested Development," "Deadwood" and "Lost." "Scrubs," meanwhile, enjoyed a revival.