My Little Pony Friendship is Magic - Hasbro - Comics x36 [4K HD!] Season 4 Episode 1-2 [Part 1] and [Part 2] - Princess Twilight Sparkle
Info: Twilight Sparkle is still adjusting to her new duties as a princess as well as learning how to fly with her new wings, and feels disappointed after her Ponyville friends visit her just before the Summer Sun Celebration. Shortly thereafter, Princesses Celestia and Luna go missing, and Twilight learns that the Everfree Forest near Ponyville has grown out of control. She goes back to find her friends having no luck controlling the growth, and when they summon Discord using the Elements of Harmony, he professes he has nothing to do with it. Zecora, having abandoned the forest, gives Twilight a potion that will help her learn the cause of the growth. In flashback, Twilight witnesses the transformation of Princess Luna into Nightmare Moon over a thousand years prior.