You can catch up on who Dr. Blight is on Wiki (here)
Dr. Blight (voiced by Meg Ryan in 1990, Mary Kay Bergman in 1991–1995) – A mad scientist with a half-scarred face hidden behind her hair who represents the dangers of uncontrolled technology and unethical scientific experimentation. In the episode "Hog Tide," it is revealed that Dr. Blight had a grandmother named Betty Blight who assisted Don Porkaloin in his plot. In the episode "Hollywaste", it is revealed she has a sister named Bambi and through Bambi, it is revealed to the viewers and the Planeteers that Dr. Blight's first name is Babs.
I LOVE LOVE LOVED watching Captain Planet on TV growing up. And one of the best villains was Blight.