On the planet Karfel a high ranking official, Maylin Tekker, uses threats against Peri to force the Doctor (Colin Baker) to go to Earth and bring back a young woman called Vena who, while holding a precious amulet, has accidentally fallen into the Timelash - a time tunnel through which the planets tyrannical ruler the Borad banishes all rebels. The Doctor also inadvertently brings back Herbert, a man from the 19th Century, who stows away aboard the TARDIS.

The Doctor must prevent a mad scientish from destroying a planet and re-creating its people in his own image

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