When human astronaut Chuck crash lands on an alien planet, Lem decides to help him return to his spaceship and his home planet.

When Chuck, an astronaut from Earth, lands on Planet 51, Lem and his alien-obsessed friends show him around, but then the army hears of Chuck's presence and plans to catch and kill him.

A behind-the-scenes look at the animated space adventure presents original concept art, artist renderings, an inside look at the film's production and CGI, director commentaries, and information on the development of the story's characters.

"Tender and illuminating. A beautiful debut." --Rebecca Stead, Newbery Medal-winning author of When You Reach Me A heartrending and hopeful debut novel about a nonverbal girl and her passion for space exploration, for fans of See You in the Cosmos, Mockingbird, and The Thing About Jellyfish. Twelve-year-old Nova is eagerly awaiting the launch of the space shuttle Challenger--it's the first time a teacher is going into space, and kids across America will watch the event on live TV in their classrooms. Nova and her big sister, Bridget, share a love of astronomy and the space program. They planned to watch the launch together. But Bridget has disappeared, and Nova is in a new foster home. While foster families and teachers dismiss Nova as severely autistic and nonverbal, Bridget understands how intelligent and special Nova is, and all that she can't express. As the liftoff draws closer, Nova's new foster family and teachers begin to see her potential, and for the first time, she is making friends without Bridget. But every day, she's counting down to the launch, and to the moment when she'll see Bridget again. Because Bridget said, "No matter what, I'll be there. I promise."

You owe it to yourself to read about how our world is really going to "end" and to prepare yourself.

When Lem finds an alien hiding at the planetarium where he works, he is scared at first, but he agrees to help the alien, an astronaut from Earth named Chuck, recover his spaceship, which the army has locked up.