WarGames
Inside NORAD Falken tells them it is all a game and they decide to allow the missiles that the Soviet Union has reportedly fired to land to see if it is real or a game. The computer screens show the missiles landing but no missiles actually land. This convinces NORAD that the whole thing was not real. Joshua, however, decides to crack the launch codes and fire the USA's missiles for real. David and Falken try to get Joshua to stop the firing and eventually succeed when Jennifer mentions the word "games". After many tries they get Joshua to play tic-tac-toe against itself in an effort to teach it the meaning of  (a word meaning that there is no point to doing something, or that doing so will not help). Joshua tries every game of tic-tac-toe possible and then tries the same thing with every scenario within the Global Thermonuclear War game. Joshua then learns that war can not be won, and stops the game ending the threat of World War III.