Kitai's journey teaches him that only by facing your fears can you realize your full potential. His father teaches that although danger may be real, fear is just a state of mind. A cautionary tale about taking care of our planet (destroyed by years of pollution and war) is mitigated by the eye-catching new planet of 1,000 years in the future.
Constant peril. Some gross scenes with blood, as when Cypher must operate on his own leg. Kitai sees some crushed baby eagles that he wasn't able to save. Human victims of the alien monster are shown impaled on tree branches. Most of the violence depicted on screen appears in shadow or silhouette, and blood is mostly after the fact. A few moments when something scary pops out unexpectedly. The backstory involves a boy witnessing his sister being killed by an animal.
Flashback kisses and affection between husband and wife.
Cypher says "damn" once, there's one "oh God" (as an exclamation), and there's one reference to something that "sucks."
Cypher almost takes pain killers that would make him drowsy (entirely understandable given his severely broken legs and little hope of rescue) but decides against it.