Fluttershy's doubts/return of an old friend

Here's how Optimus explains his story of how the Dazzlings once took over Cybertron in Brian Griffin vs. The Mummy: Tomb of the Dragon Emperor.

[After Stuingtion's explain their story Optimus takes a deep sigh]

Brian: Hey, Optimus. What's wrong?

Optimus: Believe it or not Brian, but this is real.

Brian: What? What is?

Optimus: The Dazzlings..... once took over Cybertron.

[Everyone gasps of Optimus' words]

Brian: What?!

Optimus: Yes, it is true.

Brian: Alright, what is going on?

Optimus: Years ago, before we arrived on Earth. The Sirens wanted to gain enough power by controlling the Autobots and ruling Cybertron. But I resit it, we had a last alliance to battle the evil Sirens. I stood up for the final confrontation against Adagio and her bandmates. I told them that "Freedom is Everyone's Right". And we battled I was nearly defeated when Bumblebee turned one a super power cannon and blasted them away, while everyone else is freed from their control. And I fear they'll do it again. Soon.

Rathcet: Once that happens, Adagio will gain enough power for everyone to bow down to her.

Optimus: Thus, the world belongs to there's. Brian Griffin. You are our final hope of killing the Dazzlings once and for all.