From the introduction:
Greetings, Portal Master! I am Eon, and I have come to guide you on a great journey. Welcome to Skylands: a magical world of wonder and adventure, protected by the greatest heroes ever known – the Skylanders! It had long been my duty to watch over the Skylands, and lead them, but this task has been given to you. And now, you have found a Giant, which is why I have sought you out. Giants were the first Skylanders, from long ago, and they have not been seen in Skylands for a very long time. I believe you have found them for a reason. To better understand, let us look back. Back, 10,000 long years, to a time where Skylands was ruled by an evil empire of robots known as: the Arkeyans.
- Master Eon explains the history of the Giants to the Portal Master