Mike and Geoff win a prestigious award that motivates them to build a mini-tank to test against high caliber weapons. Then, the twins take the crew on a survivalist trip to test their skills and have a little fun.
The Howe twins put their firefighting robotic vehicle through a series of tests but one trial goes haywire resulting in a costly setback. Then, Mike travels to Maryland to demonstrate the Ripsaw in front of their best client.
The US Army requests that the Howe twins make improvements to their most iconic tanks called Ripsaws by converting one of them into a unmanned version. But first, they show off the Ripsaws on a science-oriented television show which could mean trouble for the Army contract after the tank's tires are damaged during filming.
The Howe twins design the Mini-Rip, a smaller version of their famous Ripsaw tank which they want to debut at a motor-sports event in New Hampshire. At the same time the brothers get an order for three Subterranean Rovers and Geoff has to present the large Ripsaw to Army officials for yet another potential contract. This increased workload puts a strain on the brothers and the crew which jeopardizes all of the projects.
Geoff is focused on designing an amphibious concept vehicle which distracts him from the core business and strains his relationship with twin brother Mike. Meanwhile, the crew is overworked and behind schedule on building a fleet of Subterranean Rovers causing Mike to switch roles with Geoff to become the responsible partner.
A SWAT team requests a test of the smallest armored tank in the world called the Badger but a previous explosives trial severely damaged the vehicle. Now, the crew is under the gun to restore the Badger quickly while also completing their other orders.