This is how Unicron vs Predaking goes in Transformers Prime: Friendship is Magic: Beast Hunters: Predacons Rising.

[Meanwhile, ???]

Predaking: The beacon. It worked!

[in Megatron's mind]

Megatron: Predaking? Alive?

Unicron: You know this primitive life-form?

Megatron: Yes a warrior once under my command, though I thought he had perished in battle. How fortunate that I was wrong, for Predaking is a loyal and powerful combatant who could very well be the greater instrument of destruction which you seek.

[In reality, ???]

Predaking: Megatron?

Unicron: Warrior! I call upon you to serve your master.

Predaking: In the name of the mighty legions of Predacons who preceded me, I shall never again yield to your charge. But I will heed your previous adviceand face my true enemy AS A BEAST!

[Predaking transforms and ???]

[In Megatron's mind]

Unicron: You dare to deceive me and have both of us destroyed?

Megatron: Perhaps not destroyed just damaged enough that our shared form will no longer be of use to you and force you to abandon what remains, for regaining my free will, even over a mangled and deficient frame, is preferable to enduring a waking life as your slave!

Unicron: For your insolence, I will only make you endure greater suffering!

[In reality, ???]


Unicron: Now...let us learn more of these mighty legions of which you spoke by peering directly into your mind.


Unicron: Ahh. I know now what I require to tear this world as under...and where I might find them.