Mabel Elizabeth King (née Washington) was an American film, stage, and television actress, and singer. She is best known for her role as Mabel "Mama" Thomas on the ABC sitcom What's Happening!! from its premiere in 1976 until the end of its second season in 1978. King's next most remembered role is that of Evillene the Witch, a role she originated in the stage musical The Wiz and reprised in Sidney Lumet's 1978 film adaptation. She recorded on the Rama Records and Amy Records labels.

King did not start acting until her mid thirties, in 1966, when she played the role of Maria in the national touring play of Porgy and Bess. The following year she played the role of Ernestina in the Broadway musical/comedy Hello, Dolly!. Then in 1972, she appeared in the Broadway musical Don't Play Us Cheap. The following year, she appeared in the film version of the play. That same year, she played the Queen of Myrthia in the horror film Ganja & Hess. In January 1975, she played the role of Evilene, the Wicked Witch of the West in the all-African-American cast of the Broadway musical The Wiz. The role earned her a Drama Desk Award nomination for outstanding featured actress in a musical. Her performance in The Wiz brought her much attention and soon after she received roles in the films The Bingo Long Traveling All-Stars & Motor Kings, with Billy Dee Williams and James Earl Jones, and Scott Joplin, with Billy Dee Williams and Clifton Davis. In June 1980, King returned to stage work, starring in the Broadway musical It's So Nice to Be Civilized. However, the show did poorly and closed after eight performances.

In 1976, she was offered the role of Mabel Thomas on the sitcom What's Happening!!, a role she played from 1976 to 1978. Due to disagreements with the direction the creators wanted to take the series, King left What's Happening!! in 1978 after two seasons. That same year, she reprised the role of Evillene for the 1978 film version of The Wiz. It was the second time in her career that she appeared in a movie after being in the stage version, the first being Don't Play Us Cheap. The following year, she appeared in the film The Jerk as the mother to Steve Martin's character. King received mostly guest spots on television series including Fantasy Island, The Jeffersons, Amazing Stories and Tales from the Darkside. In between, she signed on with then Hollywood agent Ruben Malaret, who negotiated her reprised role of Mama Johnson in the made-for-TV movie The Jerk, Too (1984). Her last two movie roles were Scrooged (1988) starring Bill Murray and Dead Men Don't Die (1990) starring Elliott Gould.

King was diabetic and in 1986 one of her toes was amputated as a result of the disease. In 1990, King suffered a stroke and entered the Motion Picture & Television Country House and Hospital in Woodland Hills, California. In 1991, King's diabetes resulted in the amputation of her left leg. In 1994, her right leg was also amputated. King would also lose one of her arms to diabetes. Her son, Larry, died in 1996.[9] King died on November 9, 1999 at age 66.

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