Adric, also from Doctor Who. A mathematical genius whose only failure saved all humanity.
Adric is present when, during the events of Logopolis, the Fourth Doctor falls from the Pharos Project radio telescope and regenerates into his fifth incarnation. He continues to travel in the TARDIS along with new companions Nyssa and Tegan, but his travels come to an end in Earthshock when he tries to stop a Cyberman-controlled freighter from crashing into Earth. The navigational controls are locked by logic codes, and Adric is entering the solution to the last code when the computer is destroyed by a dying Cyberman. He dies in the crash, while his crewmates watch in horror on the TARDIS viewscreen. His last words before the explosion kills him are "Now I'll never know if I was right". Adric dies not knowing that the freighter he was trying to stop would become the "meteor" that would wipe out the dinosaurs and lead to the rise of mammals and eventually humans (see Cretaceous -- Paleogene extinction event and Alvarez hypothesis).
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