Tsubasa RESERVoir CHRoNiCLE - Season 2 Episode 26
Wings of Tomorrow (?)

Chaos has trapped Sakura in a crystal then reveals his true form (A bird with millions of feathers that look like Sakuras). However, Sakura while imprisoned learns that Chaos cant control his body and to free him, Syaoran must beat his true form. Sakura learns who Chaos really is and why he wanted to travel with her. Who really is Chaos and will Syaoran be able to defeat his Chaoss true form?