The stars will not be mocked!
Typically, the Doctor arrives in media res, the disaster at hand already set into motion. Louis Marks’ “The Masque of Mandragora” (Story Production Code 4M) instead posits the Doctor as the proximate, though unwitting, cause of all the story’s problems. The series to date has rarely employed this technique, and seldom with such drastic consequences; one must go back to the First Doctor and “The Ark” for an analogous example of the Doctor being so directly responsible for so much death and destruction.
While the Doctor gives Sarah Jane a belated tour of the TARDIS, complete with stop in a Victorian-inspired secondary control room, a mysterious force pulls the wayward police box into the Mandragora Helix, a vortex of conscious, malevolent energy. When the TARDIS finally thuds to a stop against a pitch black backdrop, the Doctor and Sarah step out to explore, allowing a mote of Mandragora to sneak aboard unseen. That bit of Helix energy then directs the TARDIS to the pseudo-historical city-state of San Martino on the Italian peninsula in the fifteenth century.
The Doctor dismisses the detour as an interesting side effect of their stop in the Helix, occupied as he is by the fact that robed cultists kidnap Sarah and knock him unconscious scant minutes after landing. It’s not until the Doctor sees a peasant roasted by a glowing red orb that he realizes that he has brought sentient Mandragora energy to Earth. He’s rather aghast at the prospect.
If the kidnappy cultists and the scarlet orb of doom weren’t enough, the Doctor must also contend with courtly intrigue. Giuliano, the young heir apparent, struggles against his uncle, Count Frederico, for control of San Martino in the wake of the Giuliano’s father’s death, which had been foretold (and caused) by the court astrologer, Hieronymus. The first of four episodes, having established all these forces, ends with a double cliffhanger, Sarah about to be sacrificed by the cultists and the Doctor captured and facing beheading on orders of Frederico. No pacing problems in this story, as season fourteen starts with drive (and doublets).