The Chronicles of Narnia (although we do not learn their surname until "The Voyage of the Dawn Treader"), and eventually become Kings and Queens of Narnia reigning as a tetrarchy. Although introduced in the series as children, the siblings grow up into adults while reigning in Narnia. They go back to being children once they get back to their own world, but feature as adults in "The Horse and His Boy" during their Narnian reign. All four appear in "The Lion, the Witch, and the Wardrobe" and "Prince Caspian"; in the latter, however, Aslan tells Peter and Susan that they will not return, as
The Chronicles of Narnia Walden Media then co-produced a sequel "", released in May 2008, which grossed over $419 million worldwide. In December 2008 Disney pulled out of financing the remainder of the "Chronicles of Narnia" film series. Already in pre-production at the time, 20th Century Fox and Walden Media eventually co-produced "", which was released in December 2010 going on to gross over $415 million worldwide. In May 2012, producer Douglas Gresham confirmed that Walden Media's contract with the C.S. Lewis Estate had expired, and that there was a moratorium on producing any "Narnia" films outside of Walden Media. On 1 October 2013,