sentences:  When NASA agents arrive at the Simpsons home, Homer distracts them by dressing as Abraham Lincoln while Bart sneaks Kodos out.However, when Kodos kills several agents along the way, Bart begins to think Kodos's intentions are not as friendly as he was led to believe.Finally, Kodos reveals that the devices he had the Simpsons collect were for a portal-generating device so that others of his planet can come to Earth and wipe out the human race and eat their heads.