Mighty Targe is Ponyville's newest resident and he's Twilight's only royal guard. But the princess fears the stallion puts his job before his health. For his sake, Twilight allows Mighty to take some time from his duties to enjoy himself. However, a monster at Ponyville's door will force him to go into battle again. But he's not alone. A group of unlikely friends will help Mighty in more ways than one. But will Mighty come out of the battle for better or for worse?