P.T. Flea's Circus is P.T. Flea's big top circus in A Bug's Life. The "circus tent" is composed of a secondhand red and white umbrella, while P.T.'s "wagon" consists of two old empty boxes of Casey Jr. cookies, which he conveniently uses when traveling with the circus.
However, P.T. turns up on the island sometime later and reveals the bugs as circus clowns (not warriors like they had claimed). P.T. says that his "Flaming Death" act was a huge hit and he wants them back and blowing Flik's cover in the process. Atta banishes Flik and the Circus bugs, thus allowing Hopper and his gang to take over Ant Island and putting themselves in danger. Fortunately, Dot goes after them to warn them about the situation and encourages them to return. With help from P.T. and his troupe, the ants defeat Hopper and his gang for good, and Flik and Atta lure Hopper to the nest of a bird that previously attacked Flik and the troupe; Hopper initially believes the bird is just another decoy, until she squawks in his face when he teases her, and he ends up being fed to her chicks.
At the end of the film, the circus bugs leave with P.T., a reformed Molt, and a group of acrobatic ants and head back to the city. By this time, Heimlich has grown wings and is now a "beautiful butterfly", but can't fly due to his obesity. Thus, Francis and Manny have to carry him.