The Time of Humanity

When the timeline suddenly changes, with all life on Earth having been consumed by an alien entity in the twentieth century, the crew of the newly commissioned time ship Dynasty travel into the past to prevent that chain of events from occurring. During their investigation they discover that the unknown adversary who framed William for smuggling has also had a hand in these events, and that the entire human race is under threat in a way that even Temporal Security is powerless to prevent. Even time travel may not be enough to prevent the annihilation of humanity.