I came here to say Alien as well. I'm picturing Kermit as the alien, and then Robin the frog as the chestburster. I think Kermit being quiet and moving slowly would be so unsettling. Totally agree that Ms Piggy with a curly hair wig has to be Ripley. Fozzie - Ash, Gonzo - Dallas, Animal- Brett, Janice? - Lambert, Rowlf - Parker, Scooter - Kane, Statler and Waldorf - Mother, Rizzo the rat - Face Hugger.