In a Bolivian jungle, Adam and Caveman Rob pursue the fabled Executioner Wasp, Warrior Wasp, and Goliath Bird-Eating Tarantula. One causes a medical emergency, and another delivers a nightmarish bite that leaves Adam's arm partially paralyzed.
Adam and Caveman Rob head to South Africa to face the giant Bark Scorpion, the tiny Uroplectes Scorpion, and the highly venomous Lion Fish. Big pain comes in small packages, and the effects of marine animals' toxins are truly the next level of pain.
In Mexico, Adam and Caveman Rob tango with 2 torturous animals-including one that topped Justin Schmidt's pain scale. The guys up the stakes by covering their hands with hundreds of Harvester ants and 2 Pain Index records are shattered.
In Africa, Adam and Caveman Rob search for the Nile Monitor Lizard and the Velvet Ant but are attacked by an even deadlier animal and are lucky to escape with their lives. The guys experience a brutal bite that makes them question their mission.
A dangerous underwater hunt for the potentially deadly Scorpion Fish in the Baja California ocean leads to a toxic sting that puts Adam in danger and matches the highest pain score to date, while the Toe biter results in the weirdest pain profile yet.
Adam and Caveman Rob journey to the Asian island of Bali and face off with the Fire Urchin that almost knocks out Caveman Rob, and the Rove Beetle, which surpasses the record for the highest pain score to date and causes permanent damage.
The guys encounter two creatures of the Amazon: The Paraponera clavata aka The Bullet Ant, and the Red-Bellied Piranha.
Adam and Caveman Rob wrap up the season in Indonesia, with the two worst bites to date, from a Giant Asian Centipede and a 16-foot Reticulated Python. Vomiting, stitches, and rivers of blood make them ask if they are able to continue their research.
This special episode spotlights the most compelling and dangerous moments from Adam and Caveman Rob’s journey to expand upon Justin Schmidt’s original pain index.
Adam and Caveman Rob take on America's biggest and most deadly scorpions. But their surprising result is a hugely painful wake-up call - and a new Scorpion King is crowned.
Adam has a phobia of tarantulas, so Caveman Rob picks two of the world's nastiest ones for them to endure, including a tarantula with the well-deserved nickname of "Orange Bitey Thing."
Adam and Caveman Rob get bitten by one lizard whose venom is in doubt, but not its ability to latch on and tear flesh, and another whose venom is notoriously painful; the shocking results set new records for the pain index.
In a tribute to the godfather of the pain index, Dr. Justin Schmidt, Adam and Rob tangle with a new batch of extremely painful and deadly insects; one colony of ants kicks the Schmidt out of them.
Adam thinks he's getting his revenge on Rob for selecting tarantulas earlier this season by programming Rob's phobia: centipedes; the joke is on Adam when an American centipede produces one of his most painful bites ever.
Some of the most painful animals around can be found in the backyard; Rob and Adam take on an assassin bug, a Jerusalem cricket and the brown widow spider, producing a record-setting episode of pain.
Rob and Adam test the pain dished out by a trio of unlikely creatures commonly kept in home aquariums.
Rob and Adam test the yellow head moray eel for possible venom effects but must resort to a risky, bloody bite. Venom is not the issue for the electric eel.
It's America vs Australia in a battle royale of pain administered by sharks. After getting stung by both, Adam and Rob realize that when their countries win, they lose.
Adam and Rob serve up their most annoying stings in the history of the pain index
