To help spin the spin-off, original cast members Shannen Doherty, Jason Priestley and Jennie Garth will reprise their roles as special guest stars on "90210." Joe E. Tata will return as Peach Pit cafe owner Nat.
But despite her announced participation, Tori Spelling (yet another star in the original series as well as daughter of the late TV mogul) isn't expected back.
"Earlier in the summer we anticipated that she was going to appear in the show, but those plans were postponed for personal reasons on Ms. Spelling's behalf," CW spokesman Paul McGuire said Monday. In June, Spelling gave birth to her second child with husband Dean McDermott.