Don Draper's been away for 17 months, but he's got nothing on Basil Fawlty
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"Beavis & Butt-Head" (14 years)
"Beavis & Butt-Head": MTV and Mike Judge brought the video-watching morons' original adventures to an end back in November of 1997, then brought them back to life (just as stupid and giggly as ever) in October of 2011.