Bendii Syndrome
(Spoilers)
One change to an Original Series character - Sarek, specifically - still gives me pause. Sarek is probably the most dignified and regal character in the franchise and yet, TNG re-introduces him to the series as being inflicted with Alzheimer's. I have very mixed feelings about this for various reasons, a few of which I will try to explain. First, Mark Lenard had potential for being a recurring guest star, which wasn't even open to being explored, at all, and this was a real loss to the series. And though finding out that Sarek likes Mozart was an interesting addition to the character, the ILM tear Sarek sheds during Data's solo violin performance is risible.
The show does make enough of a fuss about Sarek's importance so that someone unfamiliar with the character can sympathise with his downfall, but it's really Picard's deep admiration and respect for Sarek that makes it play, because of his Vulcan "coldness." And after the Mind Meld, it's clever in using the Captain to express aspects and inner needs of the Ambassador, but Mark Lenard's not given much of anything to do. He's playing RICHARD III, but it's being expressed for him by Sir Patrick Stewart. It's clearly a Picard show and this aspect almost completely overwhelms the Sarek guest appearance. But when Beverly reaches out to the emotionally devistated Picard and says, "I'm right here, Jean-Luc. I'm not going anywhere," it's a really beautiful moment and one of my favourites involving Bev.
Nevertheless, the introduction of Vulcan Alzheimer's is interesting, especially considering how this particular species is so heavily immersed in mind games, with always maintaining emotional control, mind melds, the transferring katras and the like. So, Bendii Syndrome is a cool concept, it works on several levels, including making commentary on aging, but how it was applied here could've stood some scrutiny. This wasn't the way to introduce Sarek to TNG fans who didn't watch or really get into TOS. Sarek should've had a couple of strong episodes first, so when he does get hit with dementia, it's more appropriately impactful.