The best of Neil deGrasse Tyson: Aliens, UFOs, asteroids & more

The Rise & Fall of ET Species | Ancient Aliens

4 Relics from Beyond Planet Earth | Ancient Aliens

Cosmic Clues Through Time *Marathon* | Ancient Aliens

Brian Cox Visits ‘Alien’ Living in ‘Death Trap’ Cave | BBC Earth Science

10 Strange Creatures Science Still Can't Explain | Ancient Aliens (S20, E2) | Full Episode

Unexplained Animal Mutilations (S1) | Ancient Aliens

Answering Extra-Terrestrial Questions | Through the Wormhole | Science Channel