The Man Called Leon
Finally revealing himself, Leon, approaches Sora and says "I'm sorry, but I'm gonna have to ask you to take a little nap." Leon then strikes Sora on the back of the head an he blacks out. When Sora begins to come to, he thinks he sees Kairi, but in actuality it's Yuffie.
The scene cuts to Donald and Goofy, who are looking for Leon. Back to Sora, Leon begins to explain the Heartless are following him for his Keyblade, and that he has concealed Sora's heart so they wouldn't find him. Before he can finish explaining, the Heartless begin to attack the hotel where they are, and they are forced to abandoned the room. Sora gets separated from Leon, and when he calls out for him, Donald and Goofy fall from a ledge and lands on Sora. At that moment, a wall begins to rise all around them, and the Guard Armor falls from the sky. The Armor swings straight for Sora, but Goofy intervenes and tells Sora they'll back him up. The Guard Armor reels back and fires a laser at Sora, which connects, so Donald heals him with Cure. After a brief struggle with the Guard Armor, it lands a punch on the trio and sends them all flying into the air. Sora counters by turning around, mid-air, and lands the finishing blow.
After the battle, Donald convinces Sora to join him and Goofy on the Gummi Ship. And although Sora has his chance to find his friends now, he still seems down trodden. So, Donald says he can only come along if he's happy, because their ship "runs on smiles". Sora then changes his mood and the three exchange proper introductions, put their hands together, and proclaim "All for one and one for all!"
(Numbers indicate order of appearance.)
Items of note
Kingdom Hearts references