When this 60 tons of high-tech military hardware rumbles onto the battlefield at nearly 40 mph, there's nowhere for the enemy to hide. Behind its impenetrable armor lies one of the most effective computerized weapons systems. Its main weapon--an awesome 120mm rifled gun that can take out a football-sized moving target three miles away. Men who serve in this metallic monster claim the hard-hitting warhorse is the world's best battle tank. An underdog during military competitions in the late 1980s, the Challenger proved itself in Operation Desert Storm and was back in action for Operation Iraqi Freedom. Unique archive film, riveting reenactments, extraordinary interviews, and dramatic computer graphics tell the story of this British battlefield heavyweight and the men who have taken it into the heat of battle.