Now that the Doctor has had his freedom returned to him, along with his knowledge of time travel, he takes Jo on a test flight, and the TARDIS materialises on the Bernice, a cargo ship crossing the Indian Ocean in 1926. But all is not what it seems.
The TARDIS has actually landed inside the Miniscope, a form of miniaturised landscape in which specimens exists in a loop, and are watched by other people. The Doctor and Jo manage to find a way into other areas of the Miniscope and run into the ferocious Drashigs.
Eventually the Doctor makes his way out of the scope and is returned to full size. The Doctor runs into the two owners of the Miniscope - Vorg and Shirna, who are trying to make money by putting on a show to the local Minorians. Their problems get worse when the Doctor escapes from inside.
Two locals - Kalik and Orum - plan to overthrow their leader Zarb by releasing the Drashigs. Vorg manages to destroy the Drashigs, and the Doctor manages to return all the specimens by linking the TARDIS. Now full size, Jo materialises beside the wrecked machine.
