This imaginative summer comedy from director Barry Sonnenfeld (Get Shorty) is a lot of fun, largely on the strength of Will Smith's engaging performance as the rookie partner of a secret agent (Tommy Lee Jones) assigned to keep tabs on Earth-dwelling extraterrestrials. There's lots of comedy to spare in this bright film, some of the funniest stuff found in the margins of the major action. (A scene with Smith's character being trounced in the distance by a huge alien while Jones questions a witness is a riot.) The inventiveness never lets up, and the cast--including Vincent D'Onofrio doing frighteningly convincing work as an alien occupying a decaying human--hold up their end splendidly. --Tom Keogh