This is how Unicron's return goes in My Little Pony Transformers Prime: The Return of Harmony.

[We begin at Ponyville Maze]

[In the Earth's core]

Unicron: Thunderwing.

[Thunderwing approaches and kneels before Unicron]

Thunderwing: What is thy bidding, my master?

Unicron: There is a great disturbance.

Thunderwing: I have felt it.

Unicron: We have a new enemy. The young mare who is the wielder of the Element of Magic. I have no doubt this Alicorn is the fourth Princess.

Thunderwing: How is that possible?

Unicron: Search your feelings, Thunderwing. You will know it to be true. She could destroy us.

Thunderwing: She's just a regular old alicorn.

Unicron: The Alicorn magic is strong with her. The Alicorn of Friendship must not become a princess.

Thunderwing: If she could be turned, she would become a powerful ally.

Unicron: [intrigued] Yes... She would be a great asset. Can it be done?

Thunderwing: She will join us or die, master.

Unicron: Good. And one more thing.

Thunderwing: Yes, my master?

Unicron: Create chaos in Equestria. And grab the Element of Magic for me while you're at it.

Thunderwing: Yes, my master.

[Thunderwing flies off]

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