It's the Great Wall of China
Director: Tom Graeff. Also starred Harvey B. Dunn, King Moody and Helen Sage.
Director: Jack Arnold. Also starred Joe Sawyer, Russell Johnson and Kathleen Hughes.
Director: Norman Tokar, Also starred Roddy McDowall, McLean Steveson & Jesse White
Forbids the placing of nuclear weapons or any other weapons of mass destruction on celestial bodies and into outer space in general.
Director: Stephen Chiodo. Also starred John Vernon, Michael Siegel & Peter Licassi. Plot: Aliens who look like clowns come from outer space and terrorize a small town.
A stargazer and a schoolteacher suspect alien influence when the local townsfolk begin to act strange.