The
film
tells
the
story
of
Senn
(Justin
Long)
and
Mala
(Evan
Rachel
Wood),
two
rebellious
alien
teens
living
on
the
beautiful
planet
Terra,
a
place
that
promotes
peace
and
tolerance,
having
long
ago
rejected
war
and
weapons
of
mass
destruction.
But
when
Terra
is
invaded
by
human
beings
fleeing
a
civil
war
and
environmental
catastrophe,
the
planet
is
plunged
into
chaos.
During
the
upheaval,
Mala
befriends
an
injured
human
pilot
(Luke
Wilson)
and
each
learns
the
two
races
are
not
so
different
from
one
another.
Together
they
must
face
the
terrifying
realization
that
in a
world
of
limited
resources,
only
one
of
their
races
is
likely
to
survive.