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 has banished Flik and the Circus bugs, thus allowing Hopper and his gang takeover Ant Island and putting themselves in danger.
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."