It's the exploration of the cool, unfathomable yin-yang relationship between Will Smith's J and Tommy Lee Jones' K that elevates this third film of the franchise beyond its quirky and inventive expectations.
The actor and character that most humanizes the movie is Michael Stuhlbarg as Griffin, the alien with the gift of seeing potential futures. Griffin is both knowing and insecure. Stuhlbarg gives an affecting performance of warmth and fearful anxiety.
Brolin is brilliant in his portrayal of Agent K in 1969. The interplay between Will Smith (Agent J) and Josh Brolin (Agent K) is very entertaining. Smith uses his wide repertoire of facial expressions to great advantage.