Chris and Martin think that cheetahs can travel faster than any other creature or vehicle over the rough African savannah. Aviva takes this as a challenge, as does archenemy Zach Varmitech, and they both compete to build a ground racer that can run even faster than a cheetah. All that speed makes the Kratt brothers want to fly with the world's fastest animal, the Peregrine falcon, which can hit top speeds of 240 mph. But their efforts are side-tracked when they find out that Varmitech and his Zachbots are threatening to destroy a Peregrine falcon's nest of chicks, located on a city building, rather than in the wild. Can Martin and Chris activate their powers and harness the force of gravity to pull off a high flying creature rescue?