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Alien-busting special agents J (Will Smith) and K (Tommy Lee Jones) are back after a ten-year break, this time on the trail of vicious extra-terrestrial adversary Boris The Animal (Jemaine Clement). J finds himself travelling back in time to 1969 to save the life of his taciturn younger buddy (unnervingly played by Josh Brolin) and to put paid to bellicose Boris's plans for world domination. The original strengths of the franchise - revolting aliens, J and K's buddy chemistry - are given fresh impetus with jaw-dropping retro special effects and a genuinely touching twist.