In 1996, Klasky Csupo Animation began producing new episodes, and the show's fourth season began in 1997. As a result of the show's popularity, a series of theatrical films were released over the next five years: "The Rugrats Movie", which introduced Tommy's younger brother Dil, was released in 1998; "," which introduced Kimi, Kira, and Fifi, was released in 2000; and "Rugrats Go Wild", a crossover film with another Klasky Csupo series, "The Wild Thornberrys", was released in 2003. The final TV episode aired on August 1, 2004, bringing the series to a total of 172 episodes over nine seasons. The 13-year run (with the 2-year break) ties "Rugrats" with "King of the Hill" as one of the eighth-longest-running American animated television series.