After the events related in Thor (Thor, revisited), and Marvel's The Avengers, we find Thor back in Asgard with Loki as his prisoner. The destruction of Bifrost (in the first installment) has left the Nine Realms in a state of unrest. Thor and his Asgardian warriors have restored peace.
Meanwhile, a great threat has resurfaced to threaten the stability of the Nine Realms. Jane Foster has found a site of great energy disturbance. In there, she comes in contact with an anomalous substance that predates the birth of the universe, an energy so powerful that threatens to immerse in darkness all that exists.
The luscious feel and out of this world special effects, together with the solid screenplay, and excellent ensemble cast that made the first Thor (Thor, revisited) so successful have been kept in place. Darkness has crept in, however, and make no mistake, Thor: The Dark World is true to its title, but there is new ingredient in this installment that hasn't been as apparent before: Loki's sense of humor. Somewhat cynical, Loki's humor peppers scenes that may have been boring otherwise, and in none of the movies that came before, namely Thor (Thor, revisited) and Marvel's The Avengers, has Loki's personality threatened to steal the show. Never has he been as duplicitous or as charming.
As in Thor (Thor, revisited), the ensemble cast has fun working together and it shows, as the chemistry is palpable.