Hello...

             Spent several weeks of Summer vacation watching this film ("Alien" 1979) as a teen

                                 Brett's death was the view we got of the adult Monster...

                                                 The cat "Jones", sees it behind Brett...

                                                   Then he turns around and sees it...

 
                                                            Another good clip....

                                             Love the shots of the Monster in this one...

                                           A slightly different version of this scene...