Alsa was a teenage resident of Arcopolis in 292,009, who was made to help watch over the children there. She met the Tenth Doctor when he visited the city.
Together, they helped to destroy the Eyeless who were attacking the city. (PROSE: The Eyeless)
| Companions of the Tenth Doctor |
|---|
| | 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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