This is how Optimus and Twilight see Megatronus turn into Megatron goes in Princess Twilight Sparkle.

[Twilight and Optimus find themselves on Cybertron in the middle of Iacon]

Twilight Sparkle: Iacon!

Optimus Prime: But how? I thought it was destroyed in the war.

[Megatronus' voice comes out of nowhere]

Megatronus: Not another step. [comes out of the shadows]

Twilight Sparkle: Megatronus!

Optimus Prime: We do not understand brother. What's going on? Why are we here? How? How did Princess Celestia and Luna disappear?

Megatronus: Did you really expect me to lay idle by while you were chosen to be the next in line?

Twilight Sparkle: Next in line?

Optimus Prime: What are you talking about?

Megatronus: There can only be one powerful being on Cybertron! And that powerful being will be I!

[Megatronus turns into Megatron]

Twilight Sparkle: [gasps]

Optimus Prime: Megatron!

[Megatron blasts the roof and Optimus and Twilight duck out of the way just as Orion Pax arrives]

Orion Pax: Megatronus. I will not fight you. You must remain a gladiator. It is your duty.

Megatron: Megatronus? I am Megatron! And I have one duty now. To destroy you! And all who stand in my way! [shoots at Orion]

[Orion Pax gets out of the way as Megatron blasts a hole in the wall. Orion Pax runs through the hole, transforms and drives off]

[Megatron grins]

Megatron: And just where do you think you're going? [transforms and follows Orion]

[Optimus transforms too and Twilight gets in. They race after the two as Megatron tries to blast Orion, missing several times before getting a direct hit to Orion's chest. Orion screams in pain as he falls to the ground]

Twilight Sparkle: Oh, no!

Optimus Prime: Orion!

[They go after him as Megatron laughs triumphantly. Optimus and Twilight arrive near the seemingly dead Orion Pax]

Twilight Sparkle: No. No.

Optimus Prime: Why would Megatron do this? Why now?

[As they cry softly, Orion gets up and stands, making them gasp in awe]

Orion Pax: My brother. I am sorry. But you have given me no choice but to use this!

[Orion holds up the Matrix of Leadership]

[Optimus gasps]

[Orion puts the Matrix in his chest and turns into Optimus Prime]

[Megatron tries to blast Optimus but his beam is stronger and Megatron is defeated]

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