Man, tracking down classic 'Doctor Who' episodes can feel like time-traveling through streaming platforms! Season 1 Episode 6, 'The Aztecs,' is a gem from 1964 with the First Doctor. Last I checked, BritBox has the widest selection of vintage Who—they’ve got the rights to a ton of BBC archive stuff. If you’re in the US, it’s your best bet. HBO Max used to have some classic seasons, but their catalog shifts like the TARDIS interior.
If you’re region-locked, a VPN might help, but beware of wibbly-wobbly geo-restrictions. Physical media nerds like me sometimes resort to DVD collections (the 'Doctor Who: The Beginning' box set includes this one). Fun aside: 'The Aztecs' is wild—it’s got historical drama, ethical dilemmas, and William Hartnell at his grumpiest. The way Barbara tries to change history? Pure Time Lord controversy!