Mrs. Worthington

Mrs. Worthington is the titular antagonist of the same episode from R.L. Stine's The Haunting Hour, a series of supernatural horror stories similar to his popular Goosebumps franchise but geared towards a slightly older audience. As such, the stories often have darker endings and more severe consequences for the often child protagonists.

History
Mrs. Worthington is a mysterious paranormal entity akin to a fairy tale witch who began "life" as little more a boy's collection of drawings, his way to cope with continual bullying by his older sister. He envisioned Mrs. Worthington as an embodiment of his own suppressed desire for vengeance and continually wished for her to become real and punish his sister for tormenting him.

One night, the boy's wish is somehow granted and when his parents leave his older sister in charge. Mrs. Worthington arrives in the guise of a babysitter and plans to exact the boy's revenge, showing off her collection of torture devices and the boy instantly realizes the danger he has put his sister in and begs Mrs. Worthington not to enforce his wish, claiming he did not truly desire harm to his sister.

Mrs. Worthington reluctantly agreed to this if his sister could behave appropriately, but despite the boy trying to warn his sister about the danger she was in she continued to be both a bully to her brother and antagonistic to Mrs. Worthington, who she still believed was simply an eccentric babysitter. This angered the witch, who decided the the girl was beyond redemption and deserved what was coming to her.

After magically imprisoning the older sister and literally zipping her mouth shut, she prepared a voodoo doll of the boy's mother, whom she intended to also punish for raising such a spoiled child. The boy was horrified at how Mrs. Worthington was twisting his wishes and went upstairs to try and free his sister.

Eventually the siblings managed to reconcile and the older sister realizes just how her bullying had impacted her brother when she learns he was the one who accidentally summoned Mrs. Worthington.

When Mrs. Worthington comes upstairs and scolds the brother for freeing his sister, the boy grew angry and confronted Mrs. Worthington directly, claiming she was far worse than a simple bully (like his sister) and maybe she deserved to be punished. This angered Mrs. Worthington and she used her magic to create a doll of the boy and threatened to cut off his tongue with scissors as punishment.

Luckily for the siblings, a picture of Mrs. Worthington lay on the floor and the boy realized that by harming the picture he could also harm the witch and he finally managed to defeat her via tearing the picture up, causing Mrs. Worthington to fall to pieces.

Following the seeming destruction of Mrs. Worthington, the two siblings are shown to have grown closer due to surviving their ordeal yet in typical fashion for the show a cut-scene shows that Mrs. Worthington's disembodied hand is seen in an upper room of the house, sketching a new picture of herself.