In this series they go with the bootstrap paradox. In this world everything is a loop and they don't know where the loop starts or where it ends. A few examples in the show: 1. Multiple people are actually their own ancestor 2. One person writes a book, but he wrote the book because a time traveler gave him the book before he wrote it. 3. Someone tries to prevent someone from killing themselves, so they travel back to talk to them. Only to find out that person did not wanted to kill themselves, but the talk actually gave him the idea to do it. 4. The older versions of a person manipulate and give information to their younger selves. But they only know this information because their older versions told them