"It should be called 24/7," Fonda joked to Britain's Sun. She added there is no script yet, but it will be fun to see what happened the characters 30 years later.
"I've told them they'd better get on it before they have to call it the good, the bad, and the ugly because we ain't getting any prettier!" Parton said.
The original comedy had Fonda, Parton and Tomlin turning the tables on their unbearable boss played by Dabney Coleman.
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