Movie attempts to address sibling rivalry: Despite how the two brothers are constantly at each other's throats, they learn they should treat each other much better and look out for each other.
Positive Role Models & Representations
Spaceships are armed with guns and futuristic missiles; lizardish space aliens are menacing; crazed robot attacks boys; meteors and space weapons blow up the boys' house/spaceship. Frequent explosions, peril. Three siblings are constantly fighting -- a teen sister punches her younger brother in the face; two brothers are constantly chasing each other, tackling each other, calling each other names.
Teenaged sister wears a tight top in preparation for her night out; she develops a crush on a character who turns out to be her younger brother at a later age and remarks, "And I wanted to ... " when she discovers the truth.
Minor language, including kids' use of "d---k," "screwed," "ass," and "bee-yatch." An astronaut makes reference to passing through a "time sphincter." A teen girl develops a crush on an older astronaut; when it's revealed that the astronaut comes from the future and is her younger brother, she remarks, "And I wanted to ... " without articulating the clear sexual insinuation.