At Least Mullet Over? 785 Richard Lawson 08/13/08 12:34PM Filed to: Casting Casting 90210 Television Tori Spelling dropped out, Jennie Garth is bummed, and now Ian Ziering says he will not appear on the new 90210 because it "might be a step backwards." Ahh the arrogance of youth. Uh, I mean. Middle age.