If you thought T-Rex was the scariest dinosaur - think again. In "Extreme Dinosaurs," Paleontologist Dr. Phillip Currie believes he has found a six-ton flesh-eating dinosaur that hunted its prey in packs. Until recently there was little evidence to support Currie's ideas. But that's all changed with his discoveries in two mass dinosaur graves. One site lay untouched for decades until Currie himself tracked it down and the other contains the bones of a giant new species of dinosaur. In "T-Rex: Warrior or Wimp?" T-Rex's place as the scariest dinosaur comes into question. T-Rex has been known as the meanest, most bewitching dinosaur of them all. But could our picture of this monster be completely wrong? Was the T-Rex in fact a slow, lumbering creature with hideously bad breath? Was T-Rex, in fact, a wimp?