I’d never heard of Jared Harris before The Terror (haven’t seen any of the other programmes mentioned here). When I looked him up and saw that he was one of Richard Harris’s sons I went ‘Of course!’. Next thought was that he couldn’t be, because he would be too old to be his son. I then saw that RH would be 91yo now, had he lived, so that was a shocker! 
I fell down a Franklin Expedition rabbit hole last night. There’s some fascinating stuff out there, including films of the ships when they were found in 2014/16. Lots of theories about what happened to the men - there’s a full crew list on Wiki. Also anecdotal evidence from Inuit people that some men survived for some years after they abandoned ship.
I went to sleep thinking of The Terror and when I woke this morning, it was the first thing I thought about. I think I’ll be haunted for a while yet.