The Key by Marianne Curley is the third and last book in the Guardians of Time Trilogy

"The Key" is the nineteenth episode of television series Prison Break. It was first aired on April 24, 2006 in the United States. The story of the episode was created by Paul Scheuring with the teleplay written by Zack Estrin and Matt Olmstead.

The Key is the fifty-second episode of the French animated television series Code Lyoko and the fifth installment of the five-part Season 2 finale. It aired in France on February 8, 2006 and in the United States on December 9, 2005; coincidentally, a few weeks before Christmas.