High Quality Content by WIKIPEDIA articles! "Replaceable You" is the fourth episode of the twenty-third season of the American animated sitcom The Simpsons. It originally aired on the Fox network in the United States on November 6, 2011. In the episode, Homer gets a new assistant named Roz who is secretly out to steal his job. Meanwhile, Bart teams up with Martin Prince for the upcoming Springfield Elementary science fair, constructing robot baby seals that become popular with the senior citizens at the Springfield Retirement Castle. The role of Roz was played by American actress Jane Lynch. "Replaceable You" was seen by approximately eight million viewers during its original broadcast, and it has received mixed reviews from critics.