07/21/2008 (08:00PM - 09:00PM) (Monday) : IT'S THE FIRST ROUND OF THE SEMI-FINALS AND THE PREMIERE OF "THE BEAST" ON "AMERICAN GLADIATORS" - After eight grueling weeks of opening round competition, the semi-finals begin with a bang at Gladiator Arena, as four of the strongest and fastest contenders return to battle the Gladiators one more time for a shot at the finals. Ally Davidson from Dallas, Texas has already shown what she's made of by setting a new Eliminator record in the quarter-finals. She goes up against the energetic mother of three Vanessa Warren from Colorado Springs, Colorado. If Iraq War vet Alexander Coates from Baltimore, Maryland and Tim Oliphant from Branson, Missouri didn't have enough to worry about, tonight we unleash the biggest, baddest Gladiator yet. Are you ready to meet The Beast? "American Gladiators" is hosted by Hulk Hogan ("Hogan Knows Best") and Laila Ali ("Dancing with the Stars").