Doctor Who
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Doctor Who has a long history of including huge celebrity guests, both before their breakout success and after. Doctor Who began airing in the UK on the BBC back in 1963. At that time, the show steadily grew in popularity, and it managed to attract the attention of many of the biggest stars of that era to appear on the show. Even the actors who played the titular Doctor frequently had a successful career by the time they were cast in the show, which helped to raise the prestige of the series overall.