** Originally, Episode Five was to end with all of the Thal characters massacred by the Daleks. Creator/TerranceDicks, however, asked that Creator/TerryNation not include this plot point, as the series was beginning to be criticised for its violent content.
** Latep was originally named Petal. This was changed to avoid confusion with Patel from "[[Recap/DoctorWhoS10E3FrontierInSpace Frontier in Space]]".
* OneSteveLimit: Latep was originally named Petal. This was changed to avoid confusion with Patel from Frontier In Space.
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