We loved her as Brenda Walsh in the original "Beverly Hills, 90210," now Shannen Doherty's back for multiple episodes of The CW's spin-off, "90210," including the two-hour premiere on Tuesday, September 2 at 8 p.m. -- and ET has your first look at scenes from the debut night!

In the episode, West Beverly Hills High School has approached Brenda -- last seen headed to London to study acting -- to return to her alma mater as a guest director for the school's musical production.

"90210" is the story of the Wilson family. Rob Estes plays Harry, husband to Debbie (Lori Loughlin) and son to Tabitha (Jessica Walter). He signs on as the principal of West Beverly High, his alma mater, after he moves his family from Kansas back to Beverly Hills to take care of his aging alcoholic mother.