4. Bölüm: 4. Bölüm

Bölüm Konusu

In this episode, each team has to build a sled-puller tractor which has to be under 2000 lbs. Then, the tractors will be tested in a competition which consists in pulling a medium-sized sled through a simple course. The team that pulls the sled further wins. Contestants "Jet Doctors" vs. "Missile Masters"