Out of print.

From the publisher:

Go behind the scenes of an out-of-this-world animated experience! The Art of Planet 51 is a rocket ride through Ilion Animation Studios, the visionary force responsible for this humorous and heartwarming space adventure. When Earth sends an astronaut to a new planet, the tables are turned as its inhabitants panic at this "alien" invasion. The astronaut's only hope to return home rests in the hands of Lem, a teenage Planet 51 inhabitant who learns that sometimes rules must be broken for the greater good. Interviews with the creative team complement more than 250 pieces of concept art showcasing the future of animation.