The story is about an aliens that live quietly on the ocean floor until they are compelled to destroy humanity after their eco-system is disrupted by pollution. Scientists race to stave off an apocalypse. The book was a huge bestseller in Germany and other European countries. While the likes of Al Gore's "An Inconvenient Truth" trying to stir concerns about the environment, "The Swarm" becomes the latest in a growing number of films based on the philosophy that there will be payback for mankind's abuses of the planet.

本剧讲述了原本静静地躺在海底的外星人种群，因为环境污染破坏了他们的生态环境，被迫向人类发起攻击。为避免人类遭灭绝，科学家们争分夺秒寻找对策。本剧原著一度在德国与欧洲畅销。与根据美国前总统阿尔·戈尔所著《 难以忽视的真相 》一书改编成的同类纪录片类似，都试图激发人类对环境破坏的忧虑；而本剧《蜂拥而至》则诠释了“人类破坏地球终将遭到报应”的因果论。