 After that, he sets off to reunite with the Daleks, planning to loot Earth of its art treasures and get his final revenge on the Doctor, in "Lucie Miller" / "To the Death".He repairs the Dalek Time Controller who had been hurled back through time after a battle with the Sixth Doctor and on Dalek orders leaves a virus on Earth to weaken humanity.However his plans backfire when the Daleks betray him, resulting in the deaths of Tamsin, Lucy, and the Doctor's great-grandson Alex, although the Monk saves the Doctor and Susan in an attempt to make up for his role in the Dalek attack.<ref></ref>

In an out-of-sequence encounter with the Fifth Doctor, during the events of the audio drama "The Secret History", the Monk, distraught over the death of Tamsin Drew, hijacks the Doctor's timeline in an attempt to prevent her death from coming to pass.