The Tardis materializes on the Earth-like planet of Tara. The Doctor goes fishing while Romana finds the fourth segment of the Key to Time but the powerful Count Grendel mistakes her for an android and brings her to his castle.
When Romana goes fishing for the fourth segment to the Key to Time, the Doctor just goes fishing. While on the planet of Tara, both are taken in (somewhat against their will) by two factions, both trying to achieve the throne of Tara. While Romana is mistaken for an android by Count Grendel, the Doctor and the Prince are drugged after the Doctor agrees to help repair his android.—Moviedude1