matt groening created the american animated sitcom king of the hill
the plot surrounds three aliens who travel to earth to find the most average person to test and understand humans
 the simpsons and expansion of the genre in the late 1980s and early 1990s a number of animated television programs appeared which challenged the standards  practices guidelines including the simpsons beavis and butthead the critic the brothers grunt the ren  stimpy show rockos modern life cow and chicken i am weasel spongebob squarepants duckman and all grown up