After another defeat at the hooves of Celestia, Chrysalis comes across two dead dragons and a cracked egg. She takes the egg and hatches it believing it could be the weapon she needs against the ponies of Equestria. However, as the dragon grows, learning from his brothers Thorax and Pharynx and with the attack on Canterlot approaching, Spike will leave home to discover for himself whether he will follow his mother's orders or try peace as his brother argues for.