Doctor Who: The Roots of Evil

Eleven Doctors, eleven months, eleven stories: a year-long celebration of Doctor Who! The most exciting names in children's fiction each create their own unique adventure about the time-travelling Time Lord.
When the Fourth Doctor takes Leela to visit an immense tree space station known as the Heligan Structure, little do they know that the tree has been asleep for centuries, dreaming of vengeance against a man in a blue box… As the tree awakes, the Time Lord and his companion soon discover why they are such unwelcome guests.