A group of men are stranded in the desert, and they reconstruct an airplane and get it ready to fly as their only escape.

Chuck Yeager finally breaks the sound barrier while piloting an aircraft. The people on the ground initially believe that the sonic boom was Chuck crashing but soon realize that Chuck was successful in his attempt to break the sound barrier.

Beakman explains why we keep our balance on a bike using a gyroscope. He then explains how a gyroscope works and performs a few demos to prove this.

Ethan scales a large mountain with his bare hands. After a few close calls, he reaches the top and gets a set of special glasses, which tell him his mission.

The Empire attacks the rebel base on the planet Hoth.