Martians land on Saddoun Avenue here every night, on a mission to save mankind. The people of Baghdad love it. The space aliens, in aluminum-foil suits, count a beautiful blonde, a sour-faced midget and a Darth Vader-like character among their crew. A “drunken” comedian speaks for humanity. The laughs have rocked the Victory Theater for four years, as the surreal farce “I Saw It With My Own Eyes …” has played to sold-out crowds and delivered a “message from Mars” that, for these particular Earthlings, strikes an all-too-real chord.