After principal photography was completed, the storyline was simplified and enhanced during the editing stage. The lost plot involved a peace treaty being negotiated between the Baltians and the Arquillians over the possession of a galaxy. Edgar Bug's race intercepts the galaxy to prolong the war, so that his race can feast on the carnage. The first was viewed on the monitor at MIB headquarters. Rather than demand the return of the galaxy, the aliens fire on each other using Earth as a shield.
Earth is caught in a deadly crossfire.
The other involved the talking dog, who tells Kay and Jay about the failed peace negotiation. Director Barry Sonnenfeld suggests including a talking dog scene in your film if there's a chance you might want to alter some exposition without costly reshoots. Will Smith himself suggested adding the footchase outside of the jewelry shop where he blasts at Edgar Bug in front of a large number of bystanders. And the final face-off was retooled so much prior to shooting that the large Edgar Bug puppet created by monstermaker Rick Baker had to be scrapped in favor of computer graphics. Realizing that the audience for this film wanted more than just some mildly philosophical chitchat, director Barry Sonnenfeld pushed for 45 computer graphics shots to create a more energizing ending with rocks, fire, menacing attacks from high angles, and people getting eaten and punched.