In 1935, at the height of the Great Depression, America's first "spectacle sport" was born.

Invented by Leo Seltzer, roller derby originally simulated cross-country skating, with participants furiously circling a track approximating the distance between New York and LA.

As skaters became faster and more adept at lapping the track, occasional crashes would occur as they tried to pass those ahead of them. Like any great promoter, Seltzer soon realized these collisions were the most thrilling part of the game, which he tweaked to maximize the carnage.

Two teams of five skaters now circled the pack, with each team sending out a "jammer" to skate around and lap members of the opposing team. Derby became a full-contact physical sport, with elbows, body-checks and fights galore. And the fans loved it.

By the early '50s, roller derby reached its peak, with games regularly drawing 30-40,000 fans and skaters gracing the covers of national magazines. The sport sustained its popularity through the '70s, but then slipped into pop culture oblivion — until now.

Today, in post-millennium America, "everything old is new again" — including the roller derby. A neo-derby renaissance is fully at hand, with aggressive all-girl skaters jamming the pack to restore the sport to its hard-hitting former glory.

In addition to the 100+ US leagues formed in recent years, the new roller derby finds itself in locations as diverse as Germany, Mexico, and New Zealand.  A new generation of fierce female athletes is paying homage to the energetic, explosive traditions of derby past, while updating them slightly for a more sophisticated, modern audience.

With a post-feminist, punk-inspired DIY (do-it-yourself) ethos and a hearty helping of raunchy rock'n'roll, this ain't your grandpa's roller derby. Gone are the co-ed teams (in favor of "red hot, girl-on-girl action"). Traditional "time-out" penalties have been replaced with a spin of the much-dreaded "Penalty Wheel," which dispenses wild consequences, from spankings to spontaneous karaoke, for fouls committed during play.

With veteran leagues like NYC's Gotham Girls Roller Derby and Austin's Texas Rollergirls, and other start-up leagues around the country determined to revive this outrageous, crowd-pleasing sport, a nationwide roller derby revolution has definitely begun.