Catherine Broom - or Cat - was an android built by the Seventh Doctor. She was unaware that she was an android and believed herself to be a twenty-eight year old human female from the late 20th century. (PROSE: Companion Piece)
| Companions of the Seventh Doctor |
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| | Original to television | | | | Original to prose |
| Multi-story | | | | Multi-adventure | | | | Narratively ambiguous | |
| | | Original to comics | | | | Original to audio |
| Multi-story | | | | Multi-adventure | | | | Single-adventure | |
| | | 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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