It's hard to imagine a world without Scooby Doo, but that was the reality that Hanna Barbera faced in the late 70's when Scooby Doo's network at the time, ABC, threatened to pull the plug unless something was done to bring new energy to the show.  Enter Scrappy Doo, Scooby's nephew and savior of the franchise.  Nowadays, he's the butt of the joke, a punchline, a villain, but in the 1980's he was just another member of the gang.  Here's the story of how the puppy everyone loves to hate saved Scooby Doo so he could continue to be loved for generations to come.