Nikki Jupiter was a private detective and briefly a companion of the Tenth Doctor.
When Nikki met the Doctor, she was seventeen. She was investigating the criminal underworld of New Memphis with her father, who was also a private detective. After Nikki stopped the corruption of the underworld, a Judoon called Rok Ma joined her detective agency. (PROSE: Judgement of the Judoon)
| Companions of the Tenth Doctor |
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| | Original to television |
| Multi-story | | | | Single-adventure | | | | Multi-adventure | | | | Narratively ambiguous | |
| | | Original to prose |
| Multi-story | | | | Single-adventure | |
| | | Original to comics |
| Multi-story | | | | Single-adventure | | | | Multi-adventure | |
| | | Original to audio |
| Multi-story | | | | Single-adventure | |
| | | Original to video games | | | Multi-adventures reference the rare instance when a companion is shown or stated to have multiple adventures with the Doctor but only appears in a single story.
If a medium is not mentioned, then this incarnation did not have companions who were original to that medium; it does not mean that this Doctor failed to appear in that medium. |
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