It's important to clarify that while she played a character named "Spider," Judy Holliday was not Black. She was a white actress, known for her comedic roles in films like "Born Yesterday."
There was no main Black actress in the original run of "The Electric Company" (1971-1977). However, there were numerous Black actors who appeared on the show in various roles, including:
* Morgan Freeman
* Bill Cosby
* Melvin Van Peebles
* Yaphet Kotto
It's possible you are thinking of a different show, or that the actress you're remembering was not a main character but a guest star. If you can provide more details about the show or the actress's appearance, I might be able to help you identify them.