Meet Tom, Dick, Harry and Sally. Your average family from middle America. They have an average car, an average home, and average friends, but Tom, Dick, Harry and Sally are far from average as they're aliens sent by the Big Giant Head to learn all that is learnable about Planet Earth. They start from scratch and try to blend in "behaving" as ordinary average Joes, however, their research is incomplete.
Dick (a college professor aka the High Commander) heads the family, with his 'sister' Sally (Security Officer and extreme hottie). There's his younger 'brother' Harry (Communications Officer and village idiot) and Dick's 'son' Tommy (eldest of the aliens and a high school junior). Between them they learn from their experiences and along the way show us the inconsistencies of human life in the funniest way.
While you watch this genuinely funny US Import pay special attention to Harry. One classic moment for me was when Dick opened the closet and found Harry hanging on the back of the door in a straight jacket. They pause and regard each other and Harry says "I won't learn if you keep on letting me out!" Sally challenges our views of sexual stereo types through her relationship with Officer Don of the local PD, and Dick just continually fails to get humanity. Watch for fantastic cameos from William Shatner as the Big Giant Head and John Cleese as a visiting Alien.
Buy this DVD box set. It *will* make you laugh and above all give you the reassuring feeling that while the aliens are out there, we're quite safe.
Oh yes, one last thing - make sure you practice the salute!