Sakura Meets Clow Reed
Eriol reveals his true identity to Sakura and Syaoran to be the reincarnation of Clow Reed's spirit. He sets his final challenge: turn all of the remaining Clow cards into Sakura Cards or the world will remain in eternal sleep and darkness. Sakura manages to turn six of the eight cards into Sakura Cards except for the Light and Dark ones, because both cards are loyal to Clow Reed and she is not powerful enough. Kero and Yue both help out Sakura by embedding their power into her staff, however if Sakura still fails then they will remain asleep in the staff forever.
Aired 14/03/2000EP 69 - Sakura Meets Clow Reed

Cardcaptor Sakura
One day, Kinomoto Sakura, a 4th grader stumbles upon the mysterious book of Clow. Upon opening it and reading the name of The Windy aloud, Sakura scatters the cards to the winds. Sakura is elected and appointed by Keroberos, Guardian of the Cards to capture the remaining cards. With her friend Tomoyo and rival Syaoran, Sakura begins an adventure that will forever change her.