Deep in the Northern California wildness, Russell stops at nothing to reach a nesting site; Mireya and Bryce uncover evidence that a family of Bigfoot is nearby; Ben speaks with a witness who had a chilling encounter with Bigfoot.

Russell searches a rugged hillside full of caves in Northern California's forests. Bryce speaks with a witness who hears frightening grunts. Mireya and Tobe Johnson expand their search area to determine if Bigfoot is mimicking animal sounds.