The Doctor returns to the city to keep an eye on the Graff, leaving Romana, K9 and Garron to search for Unstoffe and the first segment. However, Garron double crosses them and steals the tracer.

After the Mentiads knock the Doctor out, he discovers that Romana has been taken to the planets bridge. He then travels to the bridge to help her and ends up being forced to help repair the engines.