Commander Keen 6: Aliens Ate My Baby Sitter is the final chapter in the Commander Keen saga. Eight-year old Billy Blaze, as Commander Keen, must save his babysitter from being eaten by Bloogs.
Commander Keen 6 is also the third Keen game to get absolutely destroyed at TASVideos. Watch as Keen goes over, around, or through everything in his way to beat the entire game in a bit over three minutes. Reading the author's comments is recommended, and probably mandatory if you want to know what happened.