He is believing himself to be the Norse god Odin and stole one of his possessions, an ancient spear called the Gungnir, presumably an artifact of Atlantean origin. When the characters track him down in the frigid Nordic Mountains, he presumes Kida to be his long lost daughter and kidnaps her. His intentions are to end the world in Ragnarok. He creates a lava beast and then an ice beast to destroy the world, but well-placed explosives used by Vinnie distract the monsters long enough for Kida to retrieve the spear and vanquish the beasts. During these escapades, Kida comes into a greater understanding of just how powerful the Atlantean Crystal is, and that she must choose between hiding it and sharing it with the rest of mankind.
Having retrieved the spear, Kida realizes her father was wrong to hide the Crystal from mankind. She combines the Spear with the Heart Crystal and lifts Atlantis to the surface.