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.

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

Part one
to be added

Characters

 * Twelfth Doctor
 * Eleventh Doctor
 * Tenth Doctor
 * War Doctor
 * Clara Oswald
 * Alice Obiefune
 * Gabby Gonzalez
 * Moktek
 * Siatak
 * Reapers

Continuity

 * The Tenth Doctor states that he recently met a Doctor imposter. (TV: The Next Doctor)
 * The Tenth Doctor is untrusting of the Twelfth Doctor, believing he is "impossible". At the time he had used all but one of his regenerations, although he would eventually acquire a new cycle. (TV: Journey's End, The Time of the Doctor)
 * Clara says hello to the Eleventh Doctor "for the first time". An older Eleventh Doctor will eventually meet and travel with her. (TV: The Bells of Saint John)
 * The Doctors causing a paradox within a fixed point in time results in the appearance of the Reapers. (TV: Father's Day)