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Arthur Wiki
This article is about Mrs. MacGrady's sister. You may be looking for Martha Mealy Worm.
Gender Female
Animal Bear
Hair color Brown
Family Leah MacGrady (sister)
Cartoon debut The Great MacGrady

Martha is Mrs. MacGrady's sister. She comes over to help Mrs. MacGrady when she has cancer in "The Great MacGrady."

She also appears via webcam in "D.W., Queen of the Comeback," calling from India.

It's unknown how old Martha is, but judging from her hair (which doesn't show signs of graying/whitening), she appears to be much younger than her sister.