After learning that Twilight will be competing against her for the title of Princess of the Fall Formal, Sunset employs various ways to hinder and humiliate Twilight. She has Snips and Snails record embarrassing videos of Twilight struggling to get used to the human world and releases the videos online, and she doctors photos to frame Twilight for ruining the dance decorations. But Twilight's friends help to counter these ploys by improving Twilight's reputation, and Flash Sentry, Sunset Shimmer's ex-boyfriend, helps prove Twilight's innocence.

At the Fall Formal, when Twilight is named princess and given the crown, Sunset has Snips and Snails kidnap Spike and threatens to destroy the portal to Equestria unless Twilight gives her the crown. Twilight refuses to give the crown up, stating that her being stuck in the human world would be worth stopping Sunset. As Twilight's friends commend her bravery and sacrifice, Sunset snaps and attacks her. Despite Twilight and her friends' efforts, Sunset succeeds in getting the crown and puts it on, and a dark magic aura transforms her into a demon. With her newfound powers, Sunset transforms Snips and Snails into similar-looking minions and brainwashes the other students at the school. She reveals that she never intended to destroy the portal and plans to invade and conquer Equestria with her army of teenagers. and your a strange guy with a hoodie of mista dn you have sharp teeth and two glowing red eyes