該劇根據Frank Miller及Tom Wheeler所著的未出版同名青年向小說改編，采用Nimue的角度描述亞瑟王的傳奇，她注定會成為強大但悲劇的湖中妖女/Lady of the Lake；劇情講述Nimue母親過身后，她意外地與年輕的雇傭兵亞瑟成了伙伴，他們將結伴找尋梅林并遞交一把古老的劍。而在旅程當中，Nimue將成為對抗烏瑟王及紅色騎士團的象征人物。
When an image-conscious wild child takes a strange new drug at a party, she undergoes a shocking transformation. Desperate to reverse the effects of the drug, she is horrified to discover that she has become the key to saving the human race.