Bear Grylls gets down and dirty with two men who are terrified of rats and spiders. Back home, British carpenter Joe keeps his fear of creepy-crawlies a complete secret to avoid being ridiculed by his workmates, who come across spiders every day. Meanwhile, Neo grew up in South Africa where he developed an irrational fear of rats that’s stayed with him all the way into adulthood. Now, Joe and Neo are going to come face-to-face with their worst nightmares as Bear pushes them deep into the Mexican jungle, with its super-sized rodents and arachnids.