Heather Shyres was a member of The Ultras. She was one of the popular girls who tormented Carrie in the Locker Room. Heather also took place in throwing tampons at Carrie yelling, "Plug it up." She is also seen giving Carrie a pity look because of her crying. Heather is forced to be in Miss Desjardin's detention because she took part in tormenting Carrie. When Chris asks Heather if she will take part in ditching detention with her, she ignores her and looks away. When Carrie uses her telekinetic powers to break the Bathroom mirror, Heather walks in with a normal look, confused and not understanding what just happened. She also notices when Sue isn't feeling well while they are decorating, hinting Sue's pregnancy. Heather later gets ready for the Prom with Tina and The Watson Twins. Heather is seen getting her hair curled. She also says, "I know Chris isn't coming. She is suspended" to Tina and The Watson Twins. She attends the Prom with Brian Maxwell. At the Prom, Heather helps Tina and The Watson Twins collect the ballots, implying she agrees and helps with the prank. When Sue arrives she asks Heather where Chris is, Heather lies and says she isn't there. When the blood is poured on Carrie and the Shower Video is shown, she bursts into laughter along with the rest of The Ultras and the students. However, Heather also quickly notices when Carrie's blood begins floating and begins to worry and attempts to flee with Brian, pulling him towards the door. When he refuses to leave, she lets go and continues towards the door.When Carrie sends her telekinetic shockwave, knocking everyone down, Heather fearfully begins running as fast as possible to the exit. Before she can make it out, Carrie throws her across the room and smashes her into the fire door window which kills her. The window cracks it and leaves a spot of blood behind.
She also confirmed, that Heather had no last name, but fans use "Shyres" do to the character she is based on.
Although Heather is a secondary character, she is considered a tertiary antagonist, because she is the least participative of The Ultras.
Heather also laughs when Chris says to Carrie "You Eat Shit".
Even though Heather is said to be the nicest of the Ultras, she was still a bully and was mean to Carrie.
She and the rest of the Ultras took part of throwing tampons at Carrie and laughing at her hysterically at prom along with The Waston Twins and Tina Blake.
Her death in the trailers were seen to have a fast or slow motion. In the offical trailer, it shows a quick peak of her death. Then in the other TV spots, her death was very fast. However, in the movie, it was a very fast motion.
Heather is very clearly based on Helen Shyres, however, Helen's name is seen on the Prom King and Queen ballot and it is very possible that they are sisters or cousins.
Heather throwing tampons at Carrie
Heather walks away, while Chris confronts Sue
Heather stares at Carrie, while she leaves the bathroom, confused about what happened