Four Doctors (comic story)

Four Doctors was a miniseries published by Titan Comics. It served as a three-way crossover between Titan's ongoing series Doctor Who: The Twelfth Doctor, Doctor Who: The Eleventh Doctor and Doctor Who: The Tenth Doctor, uniting the three Doctors and their companions, as well as marking the Titan Comics début of the War Doctor. It also featured a cameo by the Ninth Doctor and Rose Tyler. It's also the first time that an incarnation from the Doctor's second regeneration cycle met two incarnations from his original cycle.

Summary
What shocking past event brings three Doctors together — to combat an unknown foe with three incarnations in its sights?

Issues

 * FD 1
 * FD 2
 * FD 3
 * FD 4
 * FD 5