Fourth My Little Pony incarnation (2010–2021) My Little Pony: Friendship Is Magic A thousand years ago, Princess Luna once ruled alongside her older sister Princess Celestia, but her jealousy over ponies sleeping through the night and the fact that her big sister was more well-known, well-loved, well-received and appreciated than she ever was and also not appreciating her work led to her transformation into Nightmare Moon, which forced Celestia to banish her to the moon using the
Elements of Harmony. Nightmare Moon first appears in the
series premiere, having returned from her banishment to plunge
Equestria into eternal night. After being defeated by
Twilight Sparkle and her friends using the Elements of Harmony, she is restored to her original form as Luna and tearfully reunites with Celestia, who welcomes her back with forgiveness and love. Throughout the early seasons, Luna struggles to adapt to modern
Equestrian society after her long absence, initially speaking in an archaic, formal manner using the
royal we and a powerful voice that frightens other ponies. The episode "
Luna Eclipsed" focuses on her attempts to connect with ponies during Nightmare Night (Equestria's equivalent of
Halloween), where she learns to overcome ponies' fear of her Nightmare Moon persona. As the series progresses, Luna develops her role of protecting the dream realm, often entering ponies' nightmares to help them overcome their fears. In the
series finale, she retires from her royal duties along with Celestia, passing their responsibilities to Twilight.
My Little Pony: The Movie Princess Luna appears at the beginning of the film alongside Celestia and
Cadance, preparing for the Friendship Festival in Canterlot. When the Storm King's forces, led by
Tempest Shadow, attack Canterlot, Luna attempts to defend the city but is turned to stone by Tempest’s obsidian orbs. She remains petrified for most of the film until the Storm King's defeat releases all the captured magic, restoring her and the other princesses to normal.
My Little Pony: Pony Life Nightmare Moon appears in a stained glass window in the second season episode "Magical Mare-story Tour."
Friendship Is Magic comic series Luna's earliest depictions shows how she used to be when she was younger as she was the 'funny one' and the one that 'could make people socialize the best' compared to Celestia. In
Legends of Magic Annual 2018, during an alternate dimension visited by Stygian and the Pillars of Equestria using Starswirl's mirror portal, a version of the Pony of Shadows kidnaps a young Princess Luna and Princess Celestia. The alternate Pony of Shadows intended to corrupt the young sisters and turn them into Nightmare Moon and Daybreaker. The Pillars of Equestria successfully rescued them; however, Luna's heart is tainted with Nightmare Force, foreshadowing future events. In
My Little Pony: Nightmare Knights, an assembled team of reformed villains, led by Princess Luna, retrieve stolen magic from the chaotic Princess Eris through one of Starswirl's many mirror portals. She encounters Daybreaker, an alternate universe Celestia corrupted by the Pony of Shadows and who killed the Nightmare Moon of that world. Featuring characters like Stygian, Capper, Tempest Shadow, and the "Great & Powerful" Trixie Lulamoon, who each adopt villainous-themed aliases for their mission. ==Equestria Girls alternate version==