Season one regular cast members include Rob Estes, Shenae Grimes, Tristan Wilds, Jessica Stroup, Dustin Milligan, Ryan Eggold, Anna Lynne Mc Cord, Michael Steger, Lori Loughlin, and Jessica Walter.Along with special guests from the original series, Jennie Garth, Shannen Doherty, and Tori Spelling.
When Harry decides to clean up the school with the help of an under-cover cop, Kimberly Mac Intyre, Adrianna finds herself caught in the middle of the investigation.
Harry is actually from Beverly Hills and comes back both to look after his mother Tabitha and to work as the principal at West Beverly Hills High School.
All of them struggle to adjust to their new lives: Annie has a hard time balancing romances, (starting with rich kid, Ty), friendships as well as popularity and identity; Dixon has issues with his adoption and African-American heritage; Harry and Debbie struggle with the revelation that Harry has a son with Tracy Clark, his former high school sweetheart.
But when Adrianna lets her guard down and reveals to Annie that she lied about hooking up with Ty to break them up, it results in Annie declaring war.
Much like the original series, Beverly Hills, 90210, 90210 follows the move of a family (parents Debbie and Harry Wilson, their daughter Annie and adopted son Dixon).