My Little Pony: Equestria Girls – Rollercoaster of Friendship

Rarity takes a summer job as a costume designer for a new amusement park. Meanwhile, the chief costume designer, Vignette Valencia, is once seen trying to have a salad, and when she tries to post a picture on social media, her smartphone sucks the salad into it, having been enchanted with Equestrian magic without her knowledge. Vignette wonders how it is possible, and thinks it is a new feature. Rarity meets Vignette and designs costumes for a special parade at the amusement park. On the day of the parade, she invites her friends, Applejack, Rainbow Dash, Pinkie Pie, Fluttershy, Sunset Shimmer and Twilight Sparkle. Vignette then decides to put up the Rainbooms on the parade.

When Fluttershy and Rainbow Dash meet with Vignette, Vignette puts up her suggestion on their looks for the parade, but they disapprove and are teleported into the phone unexpectedly by Vignette. The two end up in a white place with the salad that Vignette sucked up in the beginning. Applejack looks for Fluttershy, but cannot find either of them. Applejack then sees footage that exposes Vignette's true colors to her. She now looks for Rarity to warn her about Vignette but she does not believe her, which turns into a confrontation after Vignette denies any sort of such magical incidents, upsetting them both. In the mean time, she teleports Pinkie Pie, Sunset and Twilight when they disapprove of some over-the-top looks. They are all locked in the white place and meet Rainbow Dash and Fluttershy, sharing each other's stories and trying to get out. Vignette prepares for the parade by projecting fake versions of the Rainbooms and designing them the way she wants. She then reveals her plan to Rarity and tries to teleport her when she angrily demands Vignette to somehow give her her friends back, but gets away.

Rarity finds Applejack and tells her that they cannot let Vignette perform at the cost of losing their friends. They phone call their friends, and when Applejack opens a door, they find her friends trapped in a room in the park. Believing Vignette will teleport anything she does not like into the room, they head to the parade to stop her. All the Rainbooms use Equestrian magic to transform and destroy the phone. Vignette feels devastated, and tells that she did this because she had the philosophy of "BYBB" (Be Yourself But Better). Rarity then explains that we must not be better at the cost of harming our friends. Vignette then reveals that despite having so many fans, she does not have any friends. Rarity and Applejack offer friendship, and things end on a happy note with the Rainbooms performing the song "Photo Booth" at the parade, led by Rarity and Applejack, and having loads of fun at the amusement park.

• Tabitha St. Germain as Rarity
• Ashleigh Ball as Applejack and Rainbow Dash
• Rebecca Shoichet as Sunset Shimmer, Costume Designer in a special appearance in the song "Photo Booth"
• Tara Strong as Twilight Sparkle
• Andrea Libman as Pinkie Pie and Fluttershy
• Tegan Moss as Vignette Valencia
• James Kirk as Micro Chips
• Sam Vincent as Flim
• Scott McNeil as Flam
• Richard Newman as Security Guard

Rollercoaster of Friendship premiered on Discovery Family (a joint venture between Discovery, Inc. and Hasbro) as part of its "Summer Surprises" programming block on July 6, 2018.