The brothers' tank goes in the Guinness Book of World Records as the smallest all-terrain armoured vehicle, inspiring them to improve its design.
The team must work fast to build an off-road vehicle designed to travel in coal mine tunnels, as the delivery date for the project has already passed.
The US Army asks the Howe brothers to modify their most famous vehicles, two high-speed tanks called Ripsaw MS1 and Ripsaw MS2. Can they make MS2 operate remotely?
Geoff and Mike build a miniature version of the Ripsaw. They call their newest invention "Mini-Rip" and market it to the general public as a recreational vehicle.
Geoff builds a hi-speed concept-vehicle that can travel on water and land. It has been a life-long dream, and despite other deadlines, he decides to do it.
The brothers rush to resurrect a damaged Badger, the world's smallest armoured tank, in time to perform a fully functioning field test for a SWAT unit.
A fire in the shop sparks Mike's imagination, but can he convince Geoff his plan for a fire fighting robot has potential? And new welder Dee tries to prove herself.
The heat is on when the fire department gives the guys an opportunity to test their fire suppression robot. And Cameron is given another chance - but will he blow it?