This is how Celestia becomes Makuta's queen goes in
Princess Celestia: Hope this works.
[She hears a noise]
Princess Celestia: Huh? What's that I'm hearing?
[A poison vine appears]
Princess Celestia: Ahh! A poison vine! Get away!
[It sprays her]
[Celestia coughs five times]
Princess Celestia: I have to.... [coughs] save... [coughs] the Wheel... [coughs] of... Harmo...
[Celestia collapses unconscious]
[Minutes later, Celestia wakes up]
Princess Celestia: What happened? And why am I tied up?
[She suddenly realizes]
Princess Celestia: Oh no! Makuta has set a trap!
Makuta: Yes. Thanks to my Plunder Vines, they got you right where they want you.
Princess Celestia: Let me go, Makuta! You're corrupting the Wheel of Harmony with Dark Energon.
Makuta: Seems I haven't given you enough information about my evil plan. You see, not only do I want to take control of the Wheel of Harmony, but I want to use it to make you my Dark Queen.
Princess Celestia: Dark Queen? You planned this?!
Makuta: Yes, Princess Celestia. Soon you will succumb to the Plunder Vines' Dark Energon.
Princess Celestia: What are you going to do to me?!
Makuta: You'll see.
Princess Celestia: Please, Makuta, let me go!
[The transformation begins]