The Liberator crew are forced to investigate a metal planet made by aliens after Cally disappears.
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Writer Trevor Hoyle cooks up a rather slim plot about a planet that has been constructed of metal and whose inhabitants; the blue skinned Ultras lure passing travellers inside in order to drain their brains of knowledge and then feed them to the aforementioned pulsating brain. Hoyle doesn’t concern himself much with how they managed to build a planet when there appear to be just three of them- or if the planet made itself how it created the Ultras. Nor is he concerned with why people’s memories can be stored in physical objects. Nor indeed where the brain came from in the beginning. The fact that it looks like a massive crusty bun is therefore not the worst of the problems `Ultraworld` has.
Hoyle mixes the technological with the physical and never bothers too much with logic. The designers hardly help- for example the contents of the brain can be removed using little more than coloured lights- and can seemingly be put back without so much as a headache! So you can’t really take the episode seriously in any way.
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