The Doctor convinces the Megara to give Vivien Fay a truth test while playing for time so Romana can get back to Earth and find evidence against Vivien.

Romana is being held prisoner by Count Grendal, the Prince and his men along with the Doctor are drugged when they toast to the king after the Doctor has fixed the Prince's android. He is then accused of being involved in the Princes disappearance. They then have to figure out a plan to still get the android crowned as the Prince has vanished while the men were unconscious.