 Using a time-sensitive called Sophia, the Monk attempts to disrupt the Doctor's timeline by causing the Seventh and Sixth Doctors to switch places with the Third and Second Doctors respectively during particular adventures, hoping that the new Doctors will make mistakes and disrupt history.However his plan only succeeds when he switches the Fifth Doctor with the First, forcing the Fifth to let history be changed by escalating an outbreak of disease to the point where the he must allow an advanced alien race to take action.Sophia's abilities to see the future prompt her to restore the Fifth Doctor as she sees that the Monk's actions are making history worse in the absence of the Doctor.