My Little Pony: Friendship is Magic (Season 4)

Princess Twilight Sparkle Part 1
Twilight Sparkle struggles to adjust to her new wings and duties as a princess while she prepares for the Summer Sun Celebration away from her friends. Shortly after consoling Twilight that night, Princess Celestia is attacked by a black vine. Twilight awakens the next morning to find that Celestia and Luna have disappeared, leaving the sun and moon hanging in the sky, now split between day and night. In addition, the castle guards inform her of an overgrowth of black plants from the Everfree Forest near Ponyville. Returning to Ponyville to gather the Elements of Harmony, Twilight and her friends suspect Discord is responsible and summon him for answers, but he professes innocence. The ponies consult Zecora who, having abandoned the forest, gives Twilight a potion she says will help her learn what is causing the havoc. After drinking the potion, Twilight finds herself in an unfamiliar castle with Princess Luna, who transforms into Nightmare Moon.

Princess Twilight Sparkle Part 2
Twilight realizes that Luna's transformation is a vision of the past caused by Zecora's potion. Further flashbacks allow her to witness Celestia and Luna's discovery of the Elements of Harmony at the mystical Tree of Harmony in the Everfree Forest. Twilight and her friends enter the forest with the Elements, believing the tree to be in danger. Twilight is soon sent away by her friends as they grow concerned for her safety, but rejoins them after Discord mocks her for putting herself before her friends. Finding the tree entangled by evil vines, Twilight deduces that it needs the Elements to survive and returns them to the tree, dispelling the plants and freeing the princesses. The tree then sprouts a flower containing a chest with six keyholes, mystifying the ponies. Back in Ponyville, Discord admits to sowing the evil plants centuries in the past in a failed plot to plunder the Tree of Harmony's magic, claiming to have deliberately withheld this so as to help Twilight learn a lesson on princesshood. The Summer Sun Celebration then commences, with Twilight participating before her cheering friends.

Castle Mane-ia
Twilight goes to Celestia and Luna's old castle to research the chest from the Tree of Harmony, finding a diary kept by the sisters that explains the workings of the castle. Meanwhile, Applejack and Rainbow Dash challenge each other to stay the night in the castle, which they believe is haunted by the Pony of Shadows, while Rarity takes Fluttershy along to the castle to look for old tapestries to repair. The four inadvertently get into several hijinks of traps and devices triggered by themselves, as well as an unknown pony playing on the castle's organ, thought to be the Pony of Shadows. Twilight finds the four in a state of panic and calms them down, and together they find the organ player to be Pinkie Pie, who had followed her friends to the castle, thinking there would be a party.

Daring Don't
Rainbow Dash learns that the next Daring Do book has been delayed, and insists she and her friends need to help author A.K. Yearling finish the book faster. Arriving at Yearling's cabin, the ponies witness the author fighting a group of thugs and discover her to be Daring Do herself. Rainbow is eager to help Daring Do and follows her, but Daring Do insists she works alone and rebuffs Rainbow. In her excitement, Rainbow inadvertently ruins Daring Do's plan to retrieve a mystical ring from the thugs. Daring Do is then caught by her nemesis Ahuizotl, who takes the ring to a nearby temple to activate a doomsday device. Rainbow and her friends come to Daring Do's rescue, and together they destroy the temple and thwart Ahuizotl's plans. Daring Do appreciates Rainbow's help, and writes her into her next book as thanks.

Flight to the Finish
The fillies and colts in Ponyville compete under Rainbow Dash's coaching to be the town's flag carrier for the upcoming Equestria Games. The Cutie Mark Crusaders put together an impressive routine that showcases how all three races of pony live harmoniously in Ponyville. Diamond Tiara and Silver Spoon, who are also vying, attempt to sabotage the event by pointing out Scootaloo's inability to fly at her age. Annoyed, Scootaloo changes the routine to focus more on her flying and spends all her time practicing, exhausting Apple Bloom and Sweetie Belle. Scootaloo eventually loses hope of ever flying and drops out. When Rainbow Dash finds out, she takes Apple Bloom and Sweetie Belle back to Scootaloo's home, and re-enforces the idea that their presentation isn't about her ability to fly, but the friendships between the three of them. Scootaloo rejoins her friends, and they successfully win the competition together.

Power Ponies
Spike finds himself unneeded while the ponies clean up the royal sisters' castle, so he goes off to read a Power Ponies superhero comic issue, unaware that it possesses magical powers. When he reaches the end and reads the cryptic text on the last page, he and the ponies are sucked into the comic book. In the comic, the ponies assume the personas of the Power Ponies, while Spike is their bumbling sidekick, Humdrum, to his chagrin. The ponies learn they must defeat the supervillain Mane-iac to escape the comic, but their clumsiness with their newfound powers leaves all but Spike trapped. As the Mane-iac threatens them with her doomsday weapon, the ponies assert that Spike always comes through for them when they need him. Spike is able to use the distraction to trap the Mane-iac's henchmen and free the others, allowing them to stop the Mane-iac and safely return to Equestria.

Bats!
Applejack discovers that vampire fruit bats have infested Sweet Apple Acres, and rallies her friends to get rid of them before her orchard is destroyed. Fluttershy argues the long-term benefits posed by the bats' eating habits, but Applejack dismisses her. Fluttershy reluctantly helps her friends round up the bats, and uses her Stare to keep them in place while Twilight applies a spell that eradicates their appetite for apples. The next morning, Applejack finds that her crops are still being eaten despite Twilight's spell still being in effect. During a stakeout, she and her friends identify the culprit as Fluttershy, who has turned into a bat/pony hybrid as an unintended side-effect of the spell. Fluttershy's friends lure her to a mirror using Applejack's prized apple intended for a county fair as bait, immobilizing her with her own Stare and allowing Twilight to reverse the spell. Applejack builds a sanctuary for the bats per Fluttershy's suggestion, and apologizes for ignoring her.