This is how Unicron meets the Element Bearers goes in The Return of Unicron.
[Unicron uses his eye beams to torture Twilight]
Rainbow Dash: Hey!
Pinkie Pie: You leave her alone!
Applejack: Let her go!
Unicron: No one tells me what to do! I am the true Lord of Chaos. I am the dominator. I am the destroyer. I am Unicron, the Chaos Bringer!