T-REX is an intimate coming-of-age story about a new kind of American heroine. For the first time ever, womens boxing is included in the 2012 Olympic Games. Fighting for gold from the U.S. is Claressa 'TRex' Shields, just 17 years old, and by far the youngest competitor. From the hard knock streets of Flint, Michigan, Claressa is undefeated and utterly confident. Her fierceness extends beyond the ring. She protects her family at any cost, even when their instability and addictions threaten to derail her dream.