Book excerpt: When an unseen enemy maneuvers the three Doctors into an impossible meeting, the future of the universe itself is put at stake. It will take all of the Doctor's innate cunning and adaptability to team up with his past and present selves to uncover the immensely powerful culprit, fix the time stream, and right an ancient wrong! What mysterious event from the Doctors' collective past will have an unforgettable effect on their future?! Four Doctors is the blockbuster next chapter in the stunning ongoing adventures of each Doctor - and also stars TV companion Clara Oswald alongside comics companions Gabby Gonzalez and Alice Obiefune. It's an unmissable crossover epic from two creators at the height of their craft!