Sam Sheridan has been an amateur boxer, mixed-martial-arts fighter, professional wilderness firefighter, EMT, sailor, and cowboy, and has worked in construction at the South Pole. If he isn't ready for the apocalypse, we're all in a lot of trouble.

Despite an arsenal of skills that would put most of us to shame, when Sam had his son and settled down, he was beset with nightmares about being unable to protect him. Apocalyptic images filled his head. If a rogue wave hit his beach community, could he get out? If he was forced outside the city, could he survive in the wilderness? Let's not even talk about plagues, zombies, and aliens. Unable to quiet his mind, Sam decided to face his fears head-on, embarking on a quest to gain as many skills as possible that might come in handy should the world as we know it end.

Each possible doomsday required a different skill set. Trying to navigate a clogged highway when everyone is trying to leave town? Better go to the best stunt-driving school in the country. Need to protect your family but have no ammunition? Better learn how to handle a knife. Is your kid hurt or mentally strained? Better brush up on emergency medicine and study the psychological effects of trauma. From training with an Olympic weightlifter to an apprenticeship in stealing cars with an ex-gang member, from an intense three-week gun course in the 100-degree heat of Alabama to agonizing lessons in wilderness survival, Sam left no stone unturned. Would it be enough if a meteor rocked the earth? Who's to say? But as Sam points out, it would be a damn shame to survive the initial impact only to die a few days later because you didn't know how to build a fire.