a tongue-in-cheek reply in the form of a short segment which aired three days later before a rerun of "Stark Raving Dad" in which Bart replied, "Hey, we're just like the Waltons. We're praying for an end to the Depression, too." The show also received criticism from the nuclear power industry in its early years, with its portrayal of the evil boss Mr. Burns and "bungling idiot" employees (including Homer Simpson himself) with their lack of safety and security. In a letter to the nuclear power-backed U.S. Council for Energy Awareness, producer Sam Simon apologized, stating, "I apologize that the Simpsons have offended a lot of people in the energy industry. I agree with you that in real life, Homer Simpson would not be employed at a nuclear power plant. On the other hand, he probably wouldn't be employed anywhere." Various episodes of the show have generated controversy. The Simpsons visit Australia in "Bart vs. Australia" (season six, 1995) and Brazil in "Blame It on Lisa" (season 13, 2002) and both episodes generated controversy and negative reaction in the visited countries. In the latter case, Rio de Janeiro's tourist board—which claimed that the city was portrayed as having rampant street crime, kidnappings, slums, and monkey and rat infestations—went so far as to threaten Fox with legal action. Groening was a fierce and vocal critic of the episode "A Star Is Burns" (season six, 1995) which featured a crossover with The Critic. He felt that it was just an advertisement for The Critic, and that people would incorrectly associate the show with him. When he was unsuccessful in getting the episode pulled, he had his name removed from the credits and went public with his concerns, openly criticizing James L. Brooks and saying the episode "violates the Simpsons' universe." In response, Brooks said, "I am furious with Matt, ... he's allowed his opinion, but airing this publicly in the press is going too far. ... his behavior right now is rotten." "The Principal and the Pauper" (season nine, 1997) is one of the most controversial episodes of The Simpsons. Many fans and critics reacted negatively to the revelation that Seymour Skinner, a recurring character since the first season, was an impostor. The episode has been criticized by Groening and by Harry Shearer, who provides the voice of Skinner. In a 2001 interview, Shearer recalled that after reading the script, he told