A complaint of certain movies can be that they are thin on plot. Riddick is here to prove that not every movie needs a plot.
Riddick begins by following around the titular character of Richard B. Riddick as he navigates around a planet filled with all sorts of creatures both deadly and friendly. He takes under his control a dog-like creature that becomes his companion as he tries to survive on this planet filled with danger. The only human character in these opening scenes is Riddick himself so the movie is pretty silent. Riddick does provide narration so as not to turn the film into a completely silent picture. Still, the entire film is carried on the shoulders of only Vin Diesel as Riddick in the beginning of this film. He proves in these scenes that he is a true movie star with lots of charm. He doesn't even have to say much to have the audience entertained and rooting for him to succeed in all of his adventures. Vin Diesel could be filmed pretty much doing anything and it would be entertaining enough. He just has that special certain type of charisma that is always entertaining to watch.
Eventually, however, a plot does start to find its way into the movie. A group of mercenaries make their way onto the planet in search of Riddick. What comes next is a match of wits and muscle that goes on for much of the rest of the length of the movie. There is action, suspense, and even some sexual tension as Riddick and this group of mercenaries confront each other on this deadly planet. There are moments of violence that are quite memorable, creative, and enjoyable to watch throughout the movie.
Riddick, however, is still pretty thin on plot. This is okay as the movie still keeps interest through the tension between Riddick and the mercenaries. What is less forgivable is the lack of much character development. Riddick is a fun character to follow around, but he doesn't really seem to have much going on in his brain. There just isn't much to his character and the characters he encounters are all pretty typical characters as well.
Riddick is a fun movie overall that makes good use of a minimal cast and setting. It shows that you don't need a whole lot to make something entertaining enough to sustain the length of a feature film. It may not leave a real big lasting impact on the world of cinema, but it is certainly worth at least one look just for the charms of Vin Diesel as Riddick alone.