A woman leaving for work ends up with her head impaled on an iron spike, a young father is accidentally shot with a fishing spear and a gardener's fall lodges shears in his eye, and their emergency doctors reveal the most-important part of their survival.

From ploughing a field to hanging a birdfeeder, sometimes harmless outdoor activities prove potentially fatal. These doctors perform medical miracles and take giant leaps of faith to remove the surprising foreign objects from their patients bodies.

A couple on a romantic drive end up with a Christmas tree through the wife's neck, and a man nearly dies after being pumped full of enough air to blow up a thousand party balloons, leaving doctors to perform amazing feats to expel these lethal intruders.

From a fiberglass surf board embedded in a man's skull to a skier fighting for his life on a freezing mountain, doctors work against the clock to save sporting enthusiasts whose body invaders led to near-fatal experiences.

From an airline pilot with a life-threatening injury to a woman who has lived with a pencil in her brain for 50 years, doctors must search for clues and piece together evidence of the objects that have reduced their patients' lives to pain and misery.

From an eye-wateringly long pole through a man's mouth to an accidentally ingested needle, body invaders come in all shapes and sizes, and doctors must cut something huge down to size or locate a tiny object to save their patients from fatal intruders.