Jack Black is an American actor, comedian, writer, producer, and singer. His acting career has been extensive, starring primarily in comedy films. He is the lead vocalist of the comedic rock group Tenacious D which he formed in 1994 with friend Kyle Gass.

Role in The Osbournes Edit

Jack only appeared in the advertisements for the show and never in the actual show. Here he dresses up as a younger Ozzy Osbourne and sings about the adventures that the family go through and why the audience shouldn't miss the latest series.