Smart enough to rebuild the TARDIS, patient enough to put up with Adric.
Character Overview
Nyssa, played by Sarah Sutton, made her debut in The Keeper of Traken (1981) and quickly established herself as the “quietly competent one” among the Doctor’s often bickering companions. Coming from the highly advanced and rather posh world of Traken, Nyssa was a scientist, aristocrat, and all-around “how is she putting up with this nonsense?” kind of character.
Unlike some companions, Nyssa wasn’t swept up by accident — her life was shattered by the Master (literally; he killed her father and then stole his body, as you do), so she stuck with the Doctor partly because, well, there wasn’t exactly a lot to go home to. Her grief gave her an emotional weight that balanced out the lighter chaos of the Fifth Doctor’s crowded TARDIS crew.
What made Nyssa unique was that she could go toe-to-toe with the Doctor intellectually. While Adric often fumbled equations and Tegan shouted about Heathrow, Nyssa was the one actually fixing machinery, solving problems, and staying calm. She was also one of the rare companions who never really complained about the endless danger. In fact, she often looked more annoyed at the inefficiency of alien villains than the actual threat of death.
Her departure in Terminus (1983) was bittersweet: Nyssa chose to stay behind to help cure a leprosy-like disease plaguing a spaceship full of unfortunate souls. While noble, it also felt like the writers suddenly remembered, “Wait, we have too many people on the TARDIS” and solved it by making Nyssa a full-time intergalactic nurse. Still, her compassion and intelligence gave her one of the more dignified exits of the classic series.