After almost 300 years in self-exile, the Young Doctor is visited by a member of his own people. However, the Doctor finds himself on another trial for the crimes of his current life in both the past and future.
With the Chimerian revealing himself and a past adventure being explored, the Young Doctor will discover that his personal past is not exactly how he remembered it.
Arriving at the University of Liverpool in 2012, the Young Doctor and Josh discover that an infection has spread within the campus. On lock-down, they both must work with the students to stop the infection before the end of the world.
Having crashed on a baron world, the Young Doctor and Hazel realize that they've landed on the home-world of the Mekkons mere days after the devastation.
After an encounter with Space Hornets, the Young Doctor and Hazel arrive in Paris, 1889. With a Space Hornet on the loose, the Doctor and Hazel have limited time before the Eiffel Tower opening is canceled forever.