在这部纪录片中，惨死路边的女子留下了一个儿子、一名自称是她丈夫的男子和一个像噩梦层层展开的谜团。

The adventure begins when the loving owners of three irresistible pets (Chance, a fun-loving American bulldog pup; Sassy, a hilarious Himalayan cat who lives up to her name; and Shadow, a wise old golden retriever) are forced to leave them in the temporary care of a friend who lives hundreds of miles away. But after several days, the worried animals begin to their family must be in trouble, so they decide to head for home. On their incredible journey across the ruggedly beautiful Sierras, they encounter unexpected surprises from man, beast, and nature alike.

在黄石国家公园的深处，隐藏着一个看不见的威胁，一颗炽热的定时炸弹正在慢慢积累，准备着下一次的喷发，这次喷发有可能将当地摧毁变成一个现代庞贝古城，这也将是有史以来最大的自然灾害。这座超级火山一直以来都是一个潜在的神秘威胁，让无数专家和科学家们提心吊胆，而它也不是唯一一个潜在的威胁。在这两集节目中，我们将深入研究超级火山背后的科学原理，通过观察其他火山的喷发来了解这座世界上能量最大火山的行为，以及它对整个世界的潜在威胁。