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An alien, not a human.
> There have been several episodes essentially about slavery in the 10th and 11th doctors runs.
Progressive in 1830 maybe. In the 21st century saying that slavery is bad thing is hardly revolutionary.
> The Happiness Patrol, a 7th doctor episode
A bit of left wing subtext and some caricature? So what? Very common at the time. Lots of comedians doing the same. Nothing like woke, not even a bit controversial.
But they had no reason for people to watch Who by the time you got to Whittaker, and the show should have been cancelled already but it was making too much money, so they treated her like a Cousin Oliver and made the fact that she was the First Female Doctor (not even true) into a huge thing because they had nothing else.
Who has always been progressive. Trek, too. If you were your current age in the 60s I bet you'd be railing against Kirk kissing Uhura.