To promote the movie, Harper Collins and Insight Editions published 'After Earth: United Ranger Corps Survival Manual' and 'After Earth: Kitai's Journal.'
A series of spin-off novels, sub-titled "Ghost Stories", have been planned to promote the movie, but are also intended to flesh out the concepts in the film itself. The titles of these books include 'Innocence', Peace, 'Hunted' and 'A Perfect Beast.' All books are written by writers Peter David, Michael Jan Friedman and Robert Greenberger, with illustrations by Benito Lobel.
Producer/co-writer Will Smith envisioned After Earth (2013) as a multi-platform franchise, including books, graphic novels, and interactive video games, which would all inform and add to the ideas and concepts already developed in the finished film.
Right before Kitai reaches the river, his father's cutlass is on his backpack. The cutlass disappears in the next shot, right before he starts building his raft, until Kitai picks up a new one at the crash site.
Hesper Computer:
Warning. This planet has been declared unfit for human habitation, placed under class-one quarantine by the interplanetary Authority. Under penalty law, do not attempt to land. Repeat, do not attempt to land.
Cypher Raige: It's not possible.