Gisella was in charge of the
underwater research base on Flydon Maxima. She looked like a twelve-year-old child with black eyes and dark bobbed hair. She was a mystery, one of a kind. The fact that she never aged was attributed to a rare medical condition termed Adulecentia Perpetus.
When her father,
Varlos, a former Brother of the Darksmith Collective, left the Darksmith world Karagula, he took her with him, hiding her away for safety on Flydon Maxima. Following the Tenth Doctor's arrival, she accepted his invitation to help him find Varlos and left the research base to join the Doctor. ( PROSE: ) She found her father in The Depths of Despair Paris, where he died. ( PROSE: ) She was later revealed to be an Vampire of Paris android. ( PROSE: )
The Pictures of Emptiness
After the Doctor destroyed the
Eternity Crystal and defeated the Darksmith Collective, she left his company to pursue her studies at the Space Brain. ( PROSE: )
The End of Time
Companions of the Tenth Doctor Original to television
Original to prose
Original to comics
Original to audio 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.