Japan’s Telubi-kun magazine has revealed the surprise return of classic Pokémon stars Misty and Brock to the Pokémon Sun & Moon anime for two episodes this September. It’s part of a story line in which Ash Ketchum ventures from Alola back to Kanto for a “school project”. While there, he will reunite with his old gym leader chums and will battle them once more. The episode titles in question are:

Episode 985: An Alola! in Kanto! Brock & Misty!!
Episode 986: Gym Battle! Z-Move VS Mega Evolution!!

As shown in the full magazine scan, Brock’s Steelix and Misty’s Gyarados can now Mega Evolve. Ash will also see his old Pokémon at Professor Oak’s lab.

Brock and Misty are well known to veterans, as they were old stalwarts of the show’s first five seasons. Misty made a couple of cameos in seasons 7 and 8, while Brock remained one of the main co-stars until the end of season 13 in 2010 (and guest stared in a special side story following Best Wishes!). Neither character had a major role in the throwback 20th movie Pokémon I Choose You! this year.

For those keeping watch on Japanese air dates, this Kanto two-parter of Pokémon Sun & Moon airs on TV Tokyo on September 14th and the 21st. Internationally, we should expect a few months gap for the dub to air on Disney XD.