"Since he was a young boy, Milo Thatch has believed that this great kingdom once ruled the world. His grandfather inspired him with fantastic tales of the Atlantian people, their strange world, and their mysterious crystals of incredible power. He was sure that the sunken empire existed, and he wanted to prove that Atlantis still exists today, deep within the Earth. But the old man suffered sneers of disbelief from his collegues, and died before he could prove his theory. Now Milo is determined to prove that his grandfather was right."