“Orphan Black” never had huge ratings. A July episode on BBC America, for example, garnered just 645,000 viewers, ranking it 33rd among scripted cable TV series that week.

But what the show does have is the #CloneClub, the name its fiercely loyal fans collectively go by when they gather online. And BBC America has done everything it can to cultivate their dedication.

“Their adamant vocal nature was the reason our show was anything — a success — and seen the way it was,” said Tatiana Maslany, the star of “Orphan Black” who won an Emmy for best actress in a drama last year.

Or as Sarah Barnett, the president of BBC America put it, “Every TV network, particularly at a time of surfeit of content — peak TV — is absolutely driven in wanting to create fandoms. Everybody is talking about it.”