This is how Epilogue: Thunderwing escapes Tartarus goes in Thunderwing's Revenge.
[Ryvine arrives in Tartarus with Rothbart]
Rothbart: Now, Thunderwing. You got beaten by Ryan and lost Twilight to him.
Ryvine Sparkle: Me. My masters are Unicron and Xehanort.
Thunderwing: Revenge. I must have revenge.
Ryvine Sparkle: Let me handle it. Vixyner will get Twilight for me.
Thunderwing: Help me escape.
Rothbart: Why should we? You betrayed Ryvine. I just have to leave you here as a reminder of anyone who failed us.
[Thunderwing watch as Ryvine and Rothbart leave]
Thunderwing: Uhh. Ryvine! Come back! I'll do anything! You are a friend to me! No!
[But, Ryvine and Rothbart are gone]
[Thunderwing bangs on the bar and sees he still has his strength]
Thunderwing: I still have my strength?
[Thunderwing destroys the cage holding him and unfurls his wings and flies away from Tartarus]
Thunderwing: You just wait, Ryan. Soon I will have my revenge.
[The film ends with the words: "Reconect Kingdom Hearts"]