Here is how Back at Hogwarts Castle and Brian tells his story goes in Yuna, Stewie and Brian.
Princess Luna: Where is Yuna?
Hiro: Last we've saw her, She was with Brian and Stewie.
Snowdrop: There was an earthquake.
Moon Starlight: You're right, Snowdrop. It was.
Hiro: They must be trap in the mine!
Prince Isamu: (crying)
Princess Luna: Shh, Shh, It's alright, Isamu.
Princess Cornelia: We must organize a search party.
Queen Georgina: I agree.
Princess Cornelia: Hugo! Rita! Report!
Hugo: Help is on it's way.
Rita the Fox: They should be here right about now.
Princess Cornelia: Princess Luna, Any suggestions?
Princess Luna: We must get Tigatron and Airazor right away.
Back in the caverns.
Princess Yuna: We'll wait here until help comes.
Brian Griffin: That's easy for you to say.
Stewie Griffin: I don't know how long are we going to bare it!
Princess Yuna: Stewie sure is taking it hard.
Brian Griffin: Tell me about it.
Stewie Griffin: I miss the wide open space.
Princess Yuna: Brian, Can you remember your puppyhood with Vinny?
Brian Griffin: Come to think of it, I haven't thought about it for a long time.
Stewie Griffin: Tell us, Brian. I'm dying to hear it!
Brian Griffin: A long time ago...
In the flashback.
Brian Griffin: Boy, It sure is great outside.
Vinny Griffin: You bet it is, Brother.
Brian Griffin: Look at this!!
Vinny Griffin: What the heck it that?
Brian Griffin: I don't know.
Vinny Griffin: Let's check it out!
Brian Griffin: Oh My Gosh!
Vinny Griffin: What is that!?
Brian Griffin: A Golden Arrow Tip!
Vinny Griffin: We're Rich!
The flashback ends.
Princess Yuna: Wow!
Brian Griffin: And that fortune kept Luke and his wife going ever since.
Stewie Griffin: No wonder how this happened.
Princess Yuna: We just have to keep hanging in there until help comes.
Brian Griffin: I hope you're right, Yuna.
Stewie Griffin: Me too.