Fathom basically tells the tale of an ancient underwater society of good looking sexy atlantians (tho never refferd to as atlantis) on earth. Aspen, the female heroine was found as a child by a navy captian and adopted. some years later as a sexy marine biologist she encounters mysterius stuff underwater and shes dragged into a ancient and secret war, only to discover she is far from human (yep shes one of them). all the men and women are impossibly attractive and teh technology is cooly based on coral etc. so the whole serise is a great design and a far cry from the little mermaid