Flik, an individualist and would-be inventor, lives in a colony of ants in the middle of a dried creek. They are led by Princess Atta and her mother, the Queen. The colony is oppressed by a gang of marauding grasshoppers, led by Hopper, that arrive every season demanding food from the ants. One day, when the annual offering is accidentally knocked into a stream by Flik's latest invention, a grain-harvesting device, the grasshoppers demand twice as much food as compensation. The ants trick Flik into accepting his plan to recruit "warrior bugs" to fight off the grasshoppers. While Flik actually believes in the plan, the other ants see it as an opportunity to get rid of Flik and save themselves trouble. Making his way to the "big city" (a heap of trash under a trailer), Flik mistakes a group of circus bugs, that have recently been dismissed by their money-hungry ringmaster, P.T. Flea, for the warrior bugs he seeks. The bugs in turn, mistake Flik for a talent agent and accept his offer to travel with him back to Ant Island. After they arrive, the circus bugs and Flik both discover their mutual misunderstandings during a welcome performance by the ants. The circus bugs then attempt to leave, but are forced back by a bird that attacks the group. They save Dot, Atta's younger sister, from the bird as they flee, gaining the ants' respect in the process. At Flik's insistence, they continue the ruse of being "warriors" so the troupe can continue to enjoy the attention and hospitality of the ants. The bird encounter inspires Flik into creating a false bird to scare away the grasshoppers. While the bird is being built, Hopper reveals to the other grasshoppers how greatly the ants outnumber them and worries that they will eventually turn on them...