Sarah is one of the infamous Sanderson sisters, a trio of witches who lived in colonial Salem. Together, the three would use magic to lure away children and steal their youth, in order to gain youth and immortality. Of the three, Sarah had the unique ability to enchant children via singing, thus making her responsible for luring the children away. With her sisters, entire crowds could be enspelled through their singing.
Sarah is a flirtatious yet stupid witch. She enjoys playing with people and uses her powers to enchant men. However she is also very submissive towards her oldest sister, Winifred.
Sarah is very beautiful and slender with long, wavy blonde hair and fair skin. She also dresses in shades of purple. Her dress consists of a bodice with lace sleeves, a purple skirt and red skirt with a slit up the side. When outside or flying, she wears a purple cloak.
At the beginning of the film, Sarah lures Emily Binx into the forest to the house where she and her sisters live. However what she doesn't know is that Emily's older brother, Thackery, saw them enter the forest and followed them. Inside the house she helps her two sisters, Winifred and Mary, concoct a potion which will allow them to take the life force of children in order to remain young. Thackery interrupts this however before they can give it to Emily but he is soon overcome by Winifred and they proceed to inhale Emily's life force, killing her. They then proceed to turn Thackery into a black cat with immortality so he can "live forever with his guilt." But once they perform this spell the villagers arrive at their house and as Winifred and Mary barricade the door Sarah stupidly says what they were doing.
The villagers capture the sisters and but Winifred prophesies their return via a black flame candle lit on Halloween night by a virgin. The sisters are subsequently hanged and left within the forest.
300 years later, a boy named Max Dennison takes his sister, Dani trick-or-treating and gets together with his crush, Allison whose mother used to run the museum that was the Sanderson house. They break in and Max foolishly lights the candle thinking that it's just a bunch of hocus pocus and ends up resurrecting the Sandersons. He steals Winifred's spellbook at the behest of Thackery so that the sisters cannot create the potion needed to steal the life force of children and they run.
The children all ran to the cemetery as Thackery led them however the sisters all followed them on their broomsticks and nearly got the book back. However, before they can escape Winifred raises Billy Butcherson, her former lover, back from the dead and instructs him to get the book back before flying away to the outside of the cemetery as they cannot set foot on hollowed ground. There they employ the help of a bus driver and ask him to find them children and eventually come across a house owned by a man dressed as the devil who they mistake for their master. They subsequently get into a fight with his wife as Sarah was dancing with him but are scared away by the dog. Outside they find that their broomsticks have been stolen.
The sisters then follow the children to the party where Max's parents are and after being exposed to the room by Max, Winifred takes charge and ridicules him before singing "I Put a Spell on You" therefore enchanting all the adults causing them to dance until they die. After this the children lead the sisters to the school after Allison gets an idea from a restaurant and after unwittingly walking into a kiln they are locked in and the children burn them alive.
However, they did not die due to the curse protecting them from death until sunrise and they end up capturing and locking up Jay and Ernie, the two bullies that make fun of Max after they call them ugly. Winifred, desperate for her eternal youth decides to try and make the potion from memory. Sarah, surprisingly, shouts out the correct ingredient but is hushed by Mary who thinks Winifred has all the right answers. At Max's house though he and Allison open the book therefore allowing it to send out a signal to the sisters who fly to the house, using a modern cleaning broom, mop, and vacuum cleaner as improvisations for their stolen broomsticks and take the book and kidnap Dani and Thackery. Sarah is instructed to sing her siren song to all the children of Salem so they will go to the house.
After brewing the potion again they try to get Dani to drink it but are stopped by Max who tricks them into thinking the sun has risen by using the headlights of his parents' car. However they realize they have been tricked and follow the children back to the cemetery and attempt to get Dani to drink the potion again though Winifred drops it whilst Sarah tries to help Mary escape the children. Max catches it and threatens to smash it though instead drinks it after Winifred says she'll kill Dani if he smashes it. After a struggle with him, they both fall to the ground and she starts to take his life force but the sun comes up. She turns to stone and explodes whilst Sarah and Mary implode in purple and red light.
At the end of the film, however, the book is seen and it blinks, therefore hinting the sisters may return once again.
- Sarah's siren song is an excerpt from Edgar Allan Poe's poem "Come Little Children". However, her version ends with the word "magic" whereas his ends with "shadows."