Applejack is one of the main characters in My Little Pony: Frendship is Magic and a minor character in Something Sweet to Bite series. She first appered in the first story, where she became one of the first victims of the CandyMare, along with Apple Bloom.
History
Something Sweet to Bite
On the night before Nightmare Night, she assisted her sister, Apple Bloom in making caramel apples for Nightmare Night. Using a giant cauldron full of boiling hot caramel to dip apples in, she quickly noticed Apple Bloom was missing. After not getting a response from calling for her sister, she started walking around the barn to look for her, only for the fires under the cauldron to suddenly burst open. She quickly ran back and dragged the cauldron off the fire, afterwards she looked back in the barn to see all of her caramel apples had been eaten. Thinking that Apple Bloom and her friends had did it, she called for Apple Bloom again, only to instead hear a giggling coming from the cauldron. She took a peak inside the cauldron, to find Apple Bloom's, caramel-covered body. Screaming, she quickly pulled her sister out of the pot and tried to clean her wounds. After failing to save Apple Bloom's life, she then heard that same giggle from before. Believing it to belong to her sister's killer, she runs out the barn to try and find who ever's making it