"Allan and the Sundered Veil" is a six-part horror comic story written in the style of a boy's periodical by Alan Moore and illustrated by Kevin O'Neill, included at the back of each issue of The League of Extraordinary Gentlemen, Volume I and collected at the back of that volume.
John Carter sees a vision of him fighting a Green Martian and winning Dejah Thoris as she rides a Greater Thoat mount (from the Barsoom novels).
Randolph and John soon disappear to their visions upon realizing that they are not bound to their realm, leaving only Quatermain to help the Time Traveller against their enemy.
Lady Ragnall dies of shock before her African servant, Marisa, is able to free Quatermain using her tribe's precautions against the Great Old Ones.
Despondent at the loss of his friend and his drug, Quatermain spends the next few years drifting, eventually ending in Cairo.