After they finish Dreamland and all the world, they gave a Navigation Gear to Cyborg

Cyborg: Looks like you found another one. Let me see. Okay, wait here. I be back.

He left and Ace look down, because he still sad after Duck betrayed him, losing his world, friends including Lexi

Daffy: Ace?

Wile: Now you remember what Daffy said to you. No frowning and no Sad Faces.

Ace: How can you be so Cheerful? There's still no sign of my Ancestor. Aren't you worried?

Daffy: No way.

Wile: You're Ancestors told us to find the Warrior and we found you. So as long as we stick together, it'll all work out okay. You just gotta believe in yourself, that's all.

Ace: Just believe...

Lexi: (Voice) I believe in you.

He went somewhere in a Dream and he saw Lexi, who was young.

Ace: Where am I?

Lexi's Grandma: Long ago, people lived in peace, managed in the warmth of light. Everyone loved the light. Then people began to fight over it. They wanted to keep it for themselves. And darkness was born in their hearts. The Darkness spread, swallowing the light and many people's hearts. It covered everything's, and the world disappeared. But small fragments of light survived... in the hearts of children. With these fragments of light, children rebuild the lost world. It's the world we live in now. But the true light sleeps, deep within the darkness. That's why the world's are still scattered, divided from each other. But someday, a door to the innermost darkness will open. And the true light will return. So, listen, child. Even in the deepest darkness, there will always be a light to guide you. Believe in the light, and the darkness will never defeat you. Your heart will shine with it's power and push the darkness away. Do you understand, Lexi?

Lexi: Yes.

Lexi's Grandma: Now, run along now.

She left and Ace is watching her

Ace: Lexi!?

Then he's back in Traverse Town

Ace: Huh?

Wile: What's the matter?

Ace: Umm. Nothing. Lexi? Did you call me?

Then Cyborg is back

Cyborg: I install that navigation Gear. But, you know? That world is crawling with Heartless. Don't say I didn't warn you. Here, take this along.

They left to the Galaxy train

Minutes Later

They arrived in Hollow Bastion

Wile: Hey, look at that!

Ace: I know this place...

Hollow Bastion

Wile: Hmm, that's strange.

Ace: I wonder why... I feel this warmth inside, right here.

Daffy: I think you're hungry, didn't eat anything.

Ace: (Annoyed) I'm not hungry! And I am serious!

They heard a noise

Ace: Let's go!

Duck was talking to Naruto

Duck: I can't believe it. No vessel, no help from the Heartless... tell me how did you get here?

Naruto: I believed in my heart. Nothing more to it. When my world fell into Darkness, I lost everything. My best friend, Sensei and everyone. Sakura was taken from me. I vowed I would find her again no matter what the cost. I believed to myself that I would find her. So, here I am. She must be here. And I want her back!

Duck: If you want her? Go through me!

He fighting him and Duck attacked him with power and Naruto collapse, then our Heroes stop Duck

Ace: Stop!

Duck: So, you finally made it. About time. I've been waiting for you. We've always been rivals, haven't we? You've always pushed me as I've always pushed you.

Ace: Duck...

Duck: But it all ends here. There can't be two Warriors.

Ace: What are you talking, Duck?

Duck: Let the Sword chooses... it's true warrior!

Then Ace's Sword pull away from Ace and then it disappeared

All: What!

And now the Sword is on Duck's Hand

Duck: Black Doom was right. You don't have what it takes to save Lexi and the others. It's up to me. Only the Animal Warrior will open the secret Door, and change to World.

Ace: But that's impossible. How did this happen? I'm the one who fought my way here with the sword! And Zedavia gave the Guardian Strike Sword for me!

Duck: Looks like she picked the wrong one. And you're just a delivery Bunny. Sorry, your leadership is over now. Here, go play hero with this.

He toss a Wooden Sword to Ace and he look down, because he fail everything from his world, he thought his adventures would be great and happy, but in the end it became hopeless and despair

Daffy: Guys. Let's go. You remember what Bugs said.

Wile: Well, I know Bugs said to us to follow the sword and all... But...

They walk away sadly

Daffy: Ace. I'm sorry.

They left him and Naruto is still injured

Ace: Hey, Kid don't move! You're still hurt.

Naruto: I'll be fine. And why are you here?

He look down

Naruto: I know you're giving up. But I can fight for Sakura. I'm not giving up. And that's what a ninja does. And even though I am on my own, I will fight back.

Ace know what he said, he cannot give on on Lexi, she need him and he need to do one last thing, so and he picked up a Wooden Sword.

Ace: Me too. I'm not going to give up. I'm came here for someone who was on my team.

To Be Continued...