Ozzy Osbourne was a heavy metal icon. He was also an unlikely reality TV pioneer on "The Osbournes," with his wife Sharon and kids Kelly and Jack.

As the lead singer of Black Sabbath, he helped invent heavy metal. On “The Osbournes,” he presented a comedic counterpoint to his rock ’n’ roll infamy.

The rock star was the Prince of Darkness, the father of heavy metal, but perhaps the strangest Ozzy milestone is starring on one of the first reality TV shows – with the seminal series, “The Osbournes,” which aired on MTV from 2002 to 2005.