Mortimus makes an appearance in the "Past Doctor Adventures" novel "Divided Loyalties" as part of a dream sequence set during the First Doctor's days at the Academy. Mortimus is seen as part of a group of students, taught by Borusa among others, known as the Deca, a group of activists campaigning for more intervention, alongside the Doctor, Ushas, Koschei, Magnus, Drax, a spy named Vansell, Millennia, Rallon and Jelpax. He aids the Deca in learning about the Celestial Toymaker, several members of which then undertake a disastrous trip to his realm. The Monk later makes a cameo appearance, as Mortimus, in "The Quantum Archangel", working alongside the Rani, Drax and The Master in an artificially created parallel universe.