The “Charlie’s Angels” brand refuses to fade away. After a five-season run from 1976 to 1981 and consisting of 110 episodes, the series was revived as a movie franchise starring Drew Barrymore, Cameron Diaz and Lucy Liu.

That franchise consisted of two successful “Charlie’s Angels” movies, released in 2000 and 2003. Then a television reboot was attempted in 2011.

Another film reboot is now scheduled for 2019; but no matter how many successful, or unsuccessful, continuations there are of “Charlie’s Angels,” nothing will fully capture the spark of the original series.

Men and women alike were glued to the adventures of the three female private detectives famously played by Kate Jackson, Farrah Fawcett and Jaclyn Smith. An equal mix of action and comedy, the series broke new ground by featuring strong lead female characters performing physical stunts and engaging in action reserved typically for men. (Fawcett was later replaced by another blonde actress, Cheryl Ladd; there were other later casting changes as well.)

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Before we take in any other reboots of the brand, here’s a look at five facts most people likely never knew about the original “Charlie’s Angels.”

1.) The network hated the concept. “Charlie’s Angels” was a seminal and signature hit for ABC — but the idea was not met with much enthusiasm when it was first pitched.

“Aaron [Spelling] and I were talking one night, and we always tried to go against the grain, so we thought we should do a show that is very glamorous, very pretty, very romantic. We came up with this high-style idea about three beautiful private eyes,” said producer Leonard Goldberg in an interview published at Goldberg and Spelling owned the production company behind “Angels.”

He also said it was a bit hard to sell the network on the concept. “We pitched the idea of the show to Barry Diller and Michael Eisner, who were then running ABC, at a breakfast meeting. They responded, ‘That was the worst idea we have ever heard. Could we please order breakfast?’ Subsequent to that, we had done a TV movie, ‘The Affair,’ with R.J. Wagner and the late Natalie Wood. As part of the arrangement, ABC was to put up $25,000 to write a pilot script, which would be owned by our production company and R.J. Wagner’s production company.”

The original title of the show was “The Alley Cats” — admittedly “not the classiest title,” said Leonard Goldberg. But it was a starting point.

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Goldberg said he eventually used a “what do you have to lose?” argument with the network when convincing them to let the writers put together a pilot script. The producer told Diller and Eisner, “I called Michael Eisner. I said, ‘Look, you’re going to have to send us a check for $25,000 and you have nothing to show for it. Why don’t you let us write a script? At least you will have a script to show your management.’ He said, ‘Fine, write anything you want.’ So, I told Aaron, ‘Why don’t we write what we always wanted to write?’ and he thought it was a great idea. I called R.J. Wagner, since he was going to be our partner and he said, ‘I think it’s a terrible idea, but I don’t know anything about making TV.’ So we went ahead and had a script written, and that’s how ‘Charlie’s Angels’ got started.”

2.) Charlie’s voice was a last-minute replacement. “The Charlie’s Angels Casebook” offered a look at the behind-the-scenes production of the show by Jack Condon and David Hofstede. And that book revealed that actor John Forsythe became the voice of Charlie Townsend, the never-seen boss of the Angels, who gave his orders through a voice box, only as a last-minute replacement of another actor — who showed up too drunk to record his lines for the pilot.

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Academy Award winner Gig Young was originally hired as Charlie, but Forsythe came in as a favor to the producers. He recorded the pilot lines — and that engagement turned into a far bigger job than he likely ever imagined. The actor voiced Charlie for all five seasons of the series.

3.) The show originally had a different name. “Charlie’s Angels” is an unforgettable name. The various reboots haven’t tried to reinvent the title, as “Charlie’s Angels” is striking enough to grab the attention — even today — of even those with no knowledge of the brand.

Originally, however, the series had a different name, one that sounds more like the title of a noir penny novel than a network television show. The original title was “The Alley Cats,” which Goldberg told was admittedly “not the classiest title.” But it was a starting point.

4.) Farah Fawcett had an ususual clause in her contract. Fawcett became a superstar thanks to “Charlie’s Angels.” She sported endless magazine covers in the late ’70s and early ’80s, and posters of her hung in many a young man’s bedroom, dorm room, or apartment.

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Some people don’t know she was actually married to Lee Majors, star of “The Six Million Dollar Man,” during the time she was on “Angels.”

Fawcett’s contract reportedly dictated she be released from work early enough (7 p.m.) to make it home in time to cook Majors dinner. “I love Lee and I love cooking,” she said about the stipulation, according to People.

5.) There was supposed to be a male spinoff. There was a thought at one point that the female-led program needed a male spinoff, a show that was going to be called “Toni’s Boys.” A backdoor pilot was part of season four of “Angels,” and it had three male detectives going undercover at the request of their own version of Charlie, a woman named Toni — who was supposed to have a friendly rivalry with Charlie.

The public didn’t take to the idea of the male detectives in the same way as the “Angels,” so Spelling and the producers scrapped the idea. A male “Charlie’s Angels” hasn’t been tried since.