This is how Ryvine summons Thunderwing and Unicron goes in Ryan's and Crash's Adventures of My Little Pony: Equestria Girls - Legend of Everfree.
[Ryvine walks to the fire pit with Dr. Cortex]
Dr. Neo Cortex: Are you sure you need some help to save this camp, Ryvine?
[Ryvine nods and pulls out a Dark Energon shard, snaps it in half and chucks the bit into the fire]
Ryvine Sparkle: I don't think Gaia could be real. Right?
Soundwave: [in Human Rainbow Dash's voice] I don't know. Gaia Everfree could be some creature that got booted from Equestria and ended up in this world. That's what happened with the sirens.
[Ryvine laughs and puts the Dark Energon shard in him]
Ryvine Sparkle: Oh mighty, Unicron and Thunderwing. I use my powers and Dark Energon to summon you and arrive here in human forms.
[The fire turn purple and then Unicron and Thunderwing comes out in human forms]
Unicron: Who speak to us?
Ryvine Sparkle: Your servant most humble. Ryvine Sparkle. Plunder Vine Prince of Dark Friendship and leader of the Decepticons. The one who wielded the Dark Energon which binds us. To bring you to this world once again.
Dr. Neo Cortex: I am Dr. Neo Cortex. Star of the Crash Bandicoot video game franchise. And Ryvine's creator. Together, you will help us save Camp Everfree and defeat Crash and his team.
Unicron: Prideful fools. How dare you have your son summon my life-force. I rise because I have deemed it my time.
Dr. Neo Cortex: Wait, Unicorn. We need to tell you that Ryvine gave you and your buddy some human forms.
Unicron: Thank you, Cortex. But I sense the taint of Primus? Here?
Ryvine Sparkle: These are Optimus and Ryan. The two Primes who come to save Camp Everfree.
Thunderwing: GRRRR!!! You know that the student and disciple of Primus is here?
Grizzle: Yes. And Oopsy and Human Twilight are with them.
[Thunderwing looks at Grizzle and Unicron who is in his EG form then at Ryvine]
Ryvine Sparkle: Look, my lord. How would Grizzle know that I'm your student?
Unicron: That is when Ryan became a student of Primus. You became my student because you are worthy to my life-force.
Dr. Neo Cortex: Here's the deal. You and Thunderwing help us save Camp Everfree with the camp counsellor, Gloriosa Daisy and in return Ryvine will have Ryan and his allies exterminated.
Unicron: Hmmm. Well. I think we could do some camping. Deal.
Thunderwing: Me too. But, one thing. What does the rest of us look like?
Ryvine Sparkle: For you, Thunderwing, you look like Timber Spruce. While Unicron looks like Ryan in his EG form. He even got Ryan's face as well. What happened to your old body?
Thunderwing: It got melted in lava by that Prime-prince Ryan.
Grizzle: Maybe I can give you a new model. Smaller, powerfuler, better.
Thunderwing: You mean BIGGER, powerfuler, and better!
Ryvine Sparkle: For you, bigger is BADDER. Not better.
Thunderwing: I don't care!
Grizzle: Since when did you have a hatred for Ryan, Thunderwing?
Thunderwing: Ever since Ryan beaten me and melted my body in lava. It's a bit funny being this small.
Ryvine Sparkle: Come, my lord. I'll take you to my tent. [gives two cards with a photo of Dark Energon on them] I made this tent.