Available on Investigation Discovery, Food Network, Science Channel, Discovery, TLC, Travel Channel, HGTV, Prime Video, discovery+, Hulu, Sling TV, HBO Max, Animal Planet
S1, E4: There are hundreds of billions of planets out there. Aliens could exist, but humans just haven't found them yet. They might be lethal killers who want to invade and plunder Earth, threatening human life.
Documentary · Oct 17, 2021 · 41 min