Kublai Khan

Kublai Khan, Khubilai Khan or "the last of the Great Khans", was a 13th century emperor of the Mongols and an emperor of China. (TV: Marco Polo)

He was the grandson of Genghis Khan, whom the Seventh Doctor had delivered (PROSE: Tragedy Day) and whom the First Doctor had previously claimed to have encountered as an adult (PROSE: Time and Relative).

In 1289, he met the First Doctor, Ian Chesterton, Barbara Wright and Susan Foreman. (TV: Marco Polo)

The Second Doctor would later tell his companion Jamie McCrimmon that he lost the TARDIS to Kublai Khan in a game of backgammon. (AUDIO: House of Cards)