This is how Thomas finds Predaking and Unicron VS Thomas goes in Thomas' Adventures of Transformers Prime Beast Hunters: Predacons Rising.
Unicron: Hello, Train-Prime.
[The two begin fighting]
Unicron: Where's your Alicorn girlfriend? How about when I've defeated you, I pay her a visit.
Thomas: I'll never let you beat me!
[Thomas manages to defeat Unicron]
Thomas: Release Megatron! Now!
[Megatron is able to gain momentary control]
Megatron: Train-Prime! Help me!
Thomas: Megatron?! Is that you?! Megatron?!
[Unicron regains control and punches Thomas backwards]
Unicron: When I'm through with you, I'll pay your Alicorn girlfriend a visit.
Thomas: I won't let that happen!
[Thomas managed to defeat Unicron again]
Ryan F-Freeman: [in Royal Canterlot voice] HEY, UNICRON!!!!
[Big Hero 6 and Baymax arrive]
Unicron: What are you going to tell Twilight when I tell you I have her sister-in-law at my side thanks to Mata Nui's brother, Makuta Teridax?
Thomas: [gasps] You have Cadance with you? Why, when Twilight hears about this, she is going to be so mad, she's gonna...
Ryan F-Freeman: Take that! [hits Megatron on the head with his Keyblade]
Hiro: Baymax rocket fist!
GoGo Tomago: Heads up!
Wasabi: Laser hands coming through!
Honey Lemon: Oh, yeah.
Ryan F-Freeman: [still hitting Megatron's head with his Keyblade] Megatron! You are being controlled by Unicron! I have to stop him!
[In Megatron's mind]
Megatron: Ryan? Is he going to be a Prime soon?
Unicron: My brother's student?
Megatron: Yes. He has got what it takes to become a Prime.
Unicron: So. This techno-organic wants to become a Prime, eh? Well not on my watch.
Unicron: You shall not defeat me!
[Despite using his Dark Energon weapons, Unicron is defeated by the combined might of Thomas, Ryan, and Big Hero 6]
Unicron: How is this possible?
Ryan F-Freeman: There's one magic you don't have, Unicron. And that is the Magic of Friendship!!
Unicron: Friendship is nothing but a new form of imprisonment.
Ryan F-Freeman: I will prove you wrong, you monster!
Thomas: The heroes will win.
Unicron: You don't have enough power.
Thomas: We do too.
Ryan F-Freeman: Dark Ryan will control me, Unicron. He will always be a part of me!
Unicron: Look. I can tell you about my and your mentor's story.
Ryan F-Freeman: Yeah.
[In Megatron's mind]
Megatron: You're going to tell Ryan a story? Why?
Unicron: Ryan and these 6 heroes haven't heard my story. So for that, I will tell them.
Megatron: You are quiet a nice one when you think about it. And I do think about what Ryan did.