“X-Men: Apocalypse’s” Alexandra Shipp and “Deadpool’s” Brianna Hildebrand leave the superhero world behind for a “Heathers”-esque take on the slasher genre in “Tragedy Girls.” A trailer has dropped for the dark comedy-horror film that earned strong reviews out of SXSW, where it made its world premiere back in March.

“Sometimes I just feel like nothing I do matters — like I’m not special,” Sadie (Hildebrand) tells her BFF McKayla (Shipp) in the spot. She later observes that McKayla has only received one retweet that day, and it came from her mom. Feeling invisible, the highschoolers decide to ask a social media star to give their blog a shout-out, and when he declines, describing their project as “off-brand” for his “15 million followers,” Sadie and McKayla decide to take action. The girls stab him to death. They aren’t particularly competent murderers — McKayla complains, “You’re just hitting bone, dude,” as Kayla aims for his heart — but they manage to get the job done, and their lives change overnight.

The murder is all their town can talk about, and the girls use the fear, anxiety, and excitement to their advantage. “Anybody could be next, even you,” McKayla tells a classmate. Sadie reassures the terrified girl by telling her, “You can find more information on our Tragedy Girls Twitter page.” To keep their social media followers — and to gain more — the girls become serial killers.

Shipp’s previous credits include “Straight Outta Compton,” Showtime’s “Ray Donovan,” MTV’s “Awkward,” and the titular role in the Lifetime movie “Aaliyah: The Princess of R&B.” Shipp portrayed Storm in “X-Men: Apocalypse,” a character made famous by Halle Berry.

Hildebrand is best known for playing Negasonic Teenage Warhead in “Deadpool,” a role she’ll reprise in “Deadpool 2.” “First Girl I Loved” and “Prism” are among her other credits.

“Tragedy Girls” hits theaters October 20.