Excellent, sometimes scary drama for fearless families.
Parents need to know that this complex action/sci-fi drama includes many startling, sometimes violent sequences -- starting with the chilling airplane crash that kicks off the first episode (and is revisited more than once). Other potentially upsetting scenes include injuries, fatalities, kidnappings, shootings, and fights. Important characters are threatened and sometimes killed. Characters are shown drinking (particularly in flashback sequences), and one character is a heroin addict. There's kissing and some sexual activity, though nothing too sensitive is shown. Most of the characters have dark secrets in their past, including murder.