The Skull Spider Hunt is the one-hour season 2 finale episode of My Little Pony: Transformers Prime: The Series.
Summary[]
A reformed Kylo-Tron catches the Lord of Skull Spiders and brings him to Twilight's castle where the Lord of Skull Spiders escapes from his cage by eating through the metal bars and Kylo-Tron, Sugar Belle, Party Favor, Night Glider, and Double Diamond have to find him before he reproduces more Skull Spiders.