Guardian of the Solar System
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Guardian of the Solar System was a title held by Mavic Chen in the year 4000. The Guardian ruled Earth and its dominions. He had complete control over the Space Security Service based in Central City on the planet Earth. (TV: The Daleks' Master Plan) He wore a garment with a particular symbol, which may stand for the role.
In 4041, 41 years after Mavic Chen's demise, the title of Earth's head of state was again President of Earth. (COMIC: Return of the Klytode)
The Eighth Doctor explained to Sam Jones that the Guardian of the Solar System's role in the Galactic Federation in 3999 was analogous to US President Bill Clinton's role in the United Nations in 1997. (PROSE: Placebo Effect)
A statue of the Last Guardian of the Solar System stood in Meg Carvossa's house on New Houston, as one of the various pieces of historical items she had embezzled as head of state. (AUDIO: The Yes Men)