I loved every Star Trek series, but Enterprise is better then anything else. The characters show more realistic optimism then any other Star Trek crew. And the human characters are more colorful then ever before; for the first time in any Star Trek series humans are more interesting then aliens. In the first two seasons we see a much more intense setting then in other series. Many different alien races are being given secret information from informants from the future, giving them an unfair advantage in a power struggle known as the Temporal Cold War. Season three transformed the show from a Sci-fi into a Sci-fi/epic with the introduction of the most complex, thought provoking aliens ever seen in a Star Trek series: The Xindi. The Xindi are 5 different species that belong to the same race, and they have been manipulated by outside aliens ever since the end of their civil war 120 years earlier. Since the Xindi's greatest weakness was their racial distrust of their other species, they are the perfect metaphor for the nations of Earth. Basically in season three, the greatest Star Trek series meets the greatest Star Trek aliens. Season Four has all the great moments that Enterprise fans have anticipated. The mystery of the Klingon forehead is finally explained, starfleet has it's first encounter with genetically engineered soldiers, an ancient relic restores Vulcan society, the Romulans use a prototype ship in an attempt to stop a coalition, and the Temporal Cold War comes to a end in 1944. And because these are mostly multiple-part episodes, you feel like you're watching full-length movies rather then individual episodes. The series also showed a lot of progression. Enterprise progressed more in four years then Next Generation did in seven.
Content concerns mostly consist of bad language. The language is pretty excessive compared to other Star Trek series, comparable to the language you would find in most PG-13 movies. There are some episodes that are inappropriate for kids. Ã¢Â€ÂœCold Station 12Ã¢Â€Â is a season four episode that gets a lot more gory then most. In a pretty long scene, it shows the effects of an alien sickness on a human. That scene gets pretty bloody and disgusting. Ã¢Â€ÂœStorm FrontÃ¢Â€Â is another episode that has more bad language then most. ItÃ¢Â€Â™s set during the 1940s, and depicts gangsters as having nasty mouths. Ã¢Â€ÂœHarbingerÃ¢Â€Â isnÃ¢Â€Â™t a violent episode, but there is a partially-naked scene. Ã¢Â€ÂœThe CouncilÃ¢Â€Â is a season three episode that has a fairly violent scene where one of the good guys gets knifed with a big dagger.
If you decide to let your kids watch the show, you should probably tell them to skip those episodes.