Extreme Bodies looks at human giants and examines how genetic variation and sometimes small tumors cause people to grow significantly in height. It looks at the case of George Bell who is the tallest man in the United States and uses MRI scans and computer 3-D imagining to examine his body. It also looks at the case of Dave Rasmussen a giant whose height results from a genetic mutation. It also talks to basketball player Roy Hibbert and former basketball player Richmond Edwards.