The US Army asks the Howe brothers to modify their most famous vehicles, two high-speed tanks called Ripsaw MS1 and Ripsaw MS2. Ripsaw MS1 is a remote controlled tank and Ripsaw MS2 is a manned version. Now, Mike and Geoff must make Ripsaw MS2 operat... (more)e remotely as well. In the middle of it all, Mike, Geoff and their amazing Ripsaws must star in a TV show called "Popular Science: The Future Of..." The publicity is great, but the rigorous test-drive for the TV cameras ruins the wheels on MS-2 and the twins have to order new ones. Will the new wheels arrive on time? And will a last minute technical glitch jeopardize H&H's all important military contracts?