The episode " That ' 90s Show " ( season 19, 2008 ) contradicted much of the established back-story ; for example, it was revealed that Marge and Homer were childless in the early 1990s although past episodes had suggested Bart and Lisa were born in the 1980s.

The episode " That ' 90s Show " ( season 19, 2008 ), however, contradicts much of the established backstory ; for example, it presents Homer and Marge as being childless in the late 1990s.

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