Most of this film takes place inside a sick grandpa's body.

The plot has the main characters having to find and eleminate a kidney stone that gives a boy's grandpa pain.

Characters either get caught, get chased or get in fight with several ugly-looking creatures.

Several scenes may be scary for some children, mostly due to the story taking place inside a sick grandpa's body. This film teaches people about how the body works, just made in an imaginative way.