Parallel Earth (Who's Who?)

The Parallel Earth was a alternate universe that was once visited by the Third Doctor and Sarah Jane Smith in the 1970s, where Edward IX was king of England. Parallel counterparts of the Doctor and Sarah Jane existed in this universe. The Parallel Earth was also home to at least one car which had a solar powered engine, which the prime Doctor stated would not exist on the Earth of their universe for another century (ca. 2070s). (TVA: Who's Who?)