List of Doctor Who Planets - U

U

• Umbeka A planet mentioned in the Tenth Doctor novel The Resurrection Casket. It is the planet from which ever-lasting matches originate. Its winters last for centuries, while its summers only last a few weeks.
• Unicepter IV Planet where the natives developed telepathic dreaming technology, visited in the Doctor Who Monthly comic strip "Dreamers of Death".
• Uranus is the 7th planet in The Solar System. It is mentioned in The Daleks' Masterplan as the Galaxy's only source of the element taranium.
• Urbanka in the Inokshi System, in the Galaxy 1489 is the planet of the frog-like Urbankans, the technologically-gifted aliens in the Fifth Doctor serial Four to Doomsday. Once a lush, tropical planet, its habitat was destroyed by radiation.

• Usurius is the planet of the Usurians, coincidentally a race of usurers who feature in the Fourth Doctor serial The Sun Makers.
• Utopia is the fictional place the last humans are attempting to reach in the Tenth Doctor episode "Utopia". At its co-ordinates, the last humans found darkness, and eventually cannibalised themselves into the 'Toclafane'. The Master unleashes them on present day Earth through a rift opened by a paradox generator installed in the TARDIS.
• UX-4732 Planet with a unique insectoid ecosystem, visited by the fourth Doctor in the Doctor Who Monthly comic strip "Spider-God."
• Uxarieus is the location of the Doomsday Weapon in the Third Doctor serial Colony in Space. In the novelisation, Doctor Who and the Doomsday Weapon, it was spelt Exarius.