It's got to be Mr. Frid, hands down. Without Jonathan Frid, the show would have gone to the dogs. Mr. Frid was and still is a great theatrical speaker. I think we should get on our hands and knees and hail Jonathan Frid.
With all due respect to Frid's obvious talents, I very much doubt he could have saved the show playing the role of a normal, human cousin from England. It was the decision to have him be a Vampire that made all the difference.
...It's a common misconception that Curtis preserved the DS episodes, but that's not actually true. Curtis has never owned them. ABC did and then ownership was transferred to Worldvision. ABC is who should be thanked for preserving them. However, we can thank Curtis for filing suit against ABC because, even though he didn't win, the result finally got the episodes released into syndication. A couple years ago I shared an article about the suit that appeared in Variety in 1975:Quote from: Mysterious Benefactor on April 01, 2004, 10:32:32 PM'Dark Shadows' Prompts Suit Against ABC And Worldvision
'Dark Shadows' Prompts Suit Against ABC And Worldvision
As we all are well aware, according to DC, the ratings SOARED after he was introduced.
...Though many articles certainly give that impression (along with many other erroneous impressions ), it may not be entirely true. The truth was that ABC gave DS an alotted amount of time (I believe it was 26 weeks) to improve its ratings or be canceled. However, the ratings began to climb slowly once the supernatural stuff really began to be incorporated into the show - they climbed even higher during the Laura storyline - and, of course, they climbed still further once Barnabas was introduced. We'll probably never know if ABC would have considered the pre-Barnabas rise strong enough for the show to have avoided cancellation because the alotted time for improvement ran into Barnabas' introduction, but there had been definite improvement before him. It's also interesting to note that the increased viewership of early-Barnabas over the non-supernatural DS was only a million viewers (10 million vs. 9 million) and was still far short of what viewership would be even a year later (16 million)...
Seems to me that the most important behind-the-scenes decision (the actual details of which now seem likely never to come to light) that resulted in DS leaving the airwaves in April 1971.