that goes in the martian class.... i meant to say getX() not getY().. when the Martians are at the left side of the screen, they appear a certain distance away from the right side of the screen... and is this related enough to the theme?

yes i am overriding setLocation for the martians.. but i use this code to get them of the screen: if(getY() >= 0) { setLocation(getWorld().getWidth()+100, getY()); } would that be right?