Theol Willoughby was a young boy on Trenzalore. He helped the Eleventh Doctor battle a Krynoid invasion during the Siege of Trenzalore. After the Krynoid's defeat, Theol made a special walking stick for the Doctor out of the Krynoid in memory of the farmer Pieter, who had been taken over by the Krynoid. (PROSE: An Apple a Day...)
| Companions of the Eleventh Doctor |
|---|
| | Original to television |
| Multi-story | | | | Single-adventure | | | | Multi-adventure | |
| | | Original to prose | | | | Original to comics |
| Multi-story | | | | Single-adventure | |
| | | Original to audio |
| Multi-story | | | | Single-adventure | |
| | 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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