Merriwether St. John Williams (born March 28, 1968) is a television writer and was a junior executive at Nickelodeon cartoons who issued Network notes to the shows' creators.

After leaving the executive ranks, she wrote one episode of The Angry Beavers and was responsible for writing three-paragraph outlines for SpongeBob SquarePants. Also, in 2003, she took on the duties of show runner and head writer for the Showtime animated sitcom Free For All, which did not go well as planned. She was the head of story for Camp Lazlo at Cartoon Network. She has also written two or three films with actor James Franco. Williams recently has written episodes of Adventure Time, My Little Pony: Friendship Is Magic, and Pound Puppies. She wrote the "Johnny's World Record" episode of Johnny Test.

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