"Soon Shadow… I will have my revenge.."
Mephiles makes his appearance in the Super Pony Squad's latest season "Era of Wrath" towards the end of the episode titled "Earning A Lover's Trust". Where towards the end of the episode after Shadow takes down a Shadow of Lysandramodo, Shadow explains to the squad back at the base that Mephiles might be the one held responsible for "bringing" back Lysandramodo. He doesn't know how he's still alive after all these years and decades, but with what him, Amaldo and Cindy(Amaldo's former fiancee) had encountered Shadow fears the worst for more to come…

MLP Eye vectors used for Twilight, Rarity, Rainbow Dash, and Fluttershy