This episode of Ancient Aliens speculates that Nazi German scientists experimented with advanced alien technology and built flying machines; such as the Haunebu and the Die Glocke (The Bell); and rumors that some of this technology may have made its way to the United States and helped jump start the Apollo program.

It also proposes that the propulsions developed by them were used thousands of years ago by ancient alien visitors to Earth. An example would be Vimanas of ancient India. Did the first atomic blasts occur in thousands of years ago? The Nazis were looking for some sort of ancient technology that the ancient possessed, that we had lost, and they wanted to find it fast. Was The Bell used to time travel or open a portal to 'somewhere else'? Were some of the Nazi's really aliens that looked like humans? Could today's space age technology be the result of ancient alien research?