My daughter laughed out loud at many parts of the movie. Duane "The Rock" Johnson lends a great hero voice to the astronaut, but nearly every scene is stolen by "Rover".
Many adult will find many of the "hidden" jokes funny. Much of the humor comes from hidden pop culture references relating to America in the 1950's. You will recognize cars, movie references, and the very beginnings of the counterculture movement. Nothing is too intense for children, and happily for me, the content is clean. It's just good clean fun.