This is how Starlight, Trixie, Thorax, and Discord learn of Skull Grinder goes in Skull Grinder's Revenge.

[Starlight and her friends are with Kylo-Tron]

Starlight Glimmer: Skull Grinder?

Trixie Lulamoon: What?

Thorax: He's back?

Discord: Seriously?

Kylo-Tron: Mm-hmm. As strange as it might seem, I've seen the Skull Warrior, Skull Slicer, Skull Basher, and Skull Scorpio you speak of. And their leader Skull Grinder who brought them back from the dead with his Dark Magic.

Starlight Glimmer: Huh?

Trixie Lulamoon: What?

Thorax: Seriously?

Discord: Is this true?

Kylo-Tron: Yep. He showed up about six months ago.

[Kylo-Tron shows them a flashback of what happened]

Kylo-Tron: (narrating) Me and my partner, Autobot X, went to the graveyard to investigate the strange activity going on there. We heard a strange sound and that's what we saw.

[Kylo-Tron and Autobot X see Skull Grinder bringing the Skulls back from the dead]

Skull Grinder: Magic of darkness, bringer of evil, fuel the Skulls with fury and bring us to Equestria.

[A light flashes and the Skulls are gone]

[The flashback ends]

Kylo-Tron: And ever since then, no one's ever dared to go into the graveyard.

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