10. Who should have been a companion, but didn’t get the chance?
Oh gosh, I thought this would be easy, but I just keep thinking about this and can’t come up with one answer… But I think I’d have to go with Cass from Under the Lake/Before the Flood. While there are a lot of side characters in Doctor Who I really like, not all of them could be companions. Cass totally could have been though, and it would’ve been fun to see her and the Doctor butt heads and fight for dominance all the time. But the Doctor really respected her, so I think ultimately they would have been a good team. (Runner-up is Osgood, but she found a purpose away from the Doctor and she’s livin’ her dream so she’s all good where she is.)
Thanks for asking! This one was a challenge to think about.