Danny Dirks wants nothing more than to play baseball in his father's orchard now that school is out, but he's finding out that he is no ordinary boy. With the approach of his fifteenth birthday, Danny's begun hearing voices and seeing visions of his dead mother. He's also fairly certain that the cute girl next door is really a shape-shifting dragon. All of these things lead Danny to the discovery that he is the heir of the legendary Arthur Pendragon and the linchpin in a pact established between man and dragon centuries ago. Now, rogue dragons threaten that pact and the peace that comes with it. They aim to reopen the portal through which they originally came to Earth in order to bring back a rebel dragon army. It's up to Danny to learn to channel the power that is Excalibur and, with his new friends, prevent the portal from being opened.