Adric
Adric with a genius for, and badge in, for mathematical excellence, who stowing away in the Doctor's TARDIS. Socially awkward, he gave his life to save other..
Profile
Originally was a member of a gang of teenage thieves on the planet Alzarius in E-Space with his brother Varsh. He had the ability to calculate vast sums in his head. (DW: Full Circle) Adric sneaked aboard the TARDIS, as the Doctor and Romana would discover later. Cunningly, he pretended to share the agenda of the Three Who Rule on the next planet that they visited. (DW: State of Decay)
After Romana departed (DW: Warriors' Gate) he acted briefly as apprentice to the sage-like Doctor. ([DW]]: The Keeper of Traken, Logopolis) this would change, though Tegan and Nyssa joined the Doctor and Adric and when the Doctor regenerated. (DW: Logopolis, Castrovalva)
Often frustrated by his clumsiness, and fiercely competitive, Adric struggled to find a useful role with the others.
Adric got to the decision of deciding to try to return to E-Space, when, caught up by events, he gave up his life by remaining on board Captain Briggs' freighter, which, travelling through time, crashed into prehistoric Earth and casued the death of the dinosaurs. (DW: Earthshock)