This is how The discovery of Thunderwing goes in The Attack of Thunderwing.
[We view the Mane Six looking at the unconscious Thunderwing, half buried in the Dark Energon meteor with his head, torso, and right arm sticking out]
[They tap Thunderwing's finger]
Twilight Sparkle: Girls! Get back! He's dangerous!
[Thunderwing whacks the Mane Five away from him and turns to Twilight]
Thunderwing: Death to the Element of Magic!
[Thunderwing brings his fist down on Twilight, but she dodges out of the way]
Twilight Sparkle: No. It can't be.
Ranyx: We can't let Tirek get hold of this monster. It has to be destroy here. Give me a sec and destroy him.
Thunderwing: [laughs evilly]
Twilight Sparkle: Are you one of Unicron's followers?
Ranyx: Guys, it's pointless to try and reason with him.
Thunderwing: I am Thunderwing. Release me immediately!
Tirek: I am Lord Tirek.
Thunderwing: Your name means nothing tome ! I exist only to destroy the Element of Magic! Release me so that I may find its wielder and complete my mission!
Thunderwing: HA! You, repair me? You cannot even comprehend how long have I existed. The technology of my construction is beyond your grasp.
Tirek: Well. Ryvine can fix you because he's your master's student.
Thunderwing: So be it. But understand this, Tirek. Once the Element of Magic is gone, my loyalty will return to my one true master, Unicron the Destroyer!
Tirek: Oh. Is that so? We'll just see about that.