21 Grams is a 2003 American drama film directed by Mexican director Alejandro González Iñárritu and written by Guillermo Arriaga. It stars Sean Penn, Naomi Watts, Benicio Del Toro, Danny Huston, Melissa Leo and Eddie Marsan. The film is presented in a non-linear arrangement where the lives of the characters are depicted before and after the accident. The three main characters each have 'past', 'present', and 'future' story threads, which are shown as non-linear fragments that punctuate elements of the overall story, all imminently coming toward each other and coalescing as the story progresses.