In 2149 AD, due to over-exploitation, population explosion and excessive pollution, the ecological environment of the earth is getting worse and worse, and the entire planet is gradually dying. Although scientists have made a lot of efforts to change the status quo, the status quo cannot be reversed. At this time, some scientists have put forward a theory that reversing the current situation of the earth is no longer possible, but they can try to travel back to the past through time, let the current elites return to the original, and avoid the current situation by reshaping the development process of mankind. Jim (Jason O'Mara) and his family are the tenth elite team to travel through time. When they pass through the portal, a brand new earth appears in front of them. The dense vegetation, numerous animals, and a prosperous scene surprised this group of future people. However, on this earth 85 million years ago, it was not as peaceful as imagined. Various crises continued to appear in front of the pioneers. How will they deal with it? Can they reshape the development process of mankind?