Replaceable You

BART's science fair project, a mechanical baby seal, outshines Lisa's brainy asteroid model and becomes a popular pet among the retirement home patrons. Meanwhile, Homer gets a new and eager assistant Roz, but when Homer quickly loses his job to her and discovers her evil past, he and Flanders team up to reveal her true dark colors. Blackboard : 'It's November 6th, how come we're not airing a Halloween Show?'.