Kingdom Keepers Insider is an online interactive experience where fans of the series can write fan fictions, submit opinions on parts of upcoming books, and even help write the Keepers' future. Started in 2013 after the release of Dark Passage the site first offered fans the chance to write the end of the series, which in turn was titled after all who contributed as The Insider. In the recent year or so the site has focused more along the lines of fan fictions and occasional challenges but with a new series around the bend the site lit back up with entries for the next book, Disney Lands.
On the website, Ridley Pearson asks for entries that may go in the next book. Right now he is working on book three of the Return Trilogy and is asking for entries of what happened if the Keepers meet characters from Marvel Universe. This is the link to KK meets Marvel Universe.