The series revolves around the Wilson family, along with other rich teenage students at the fictional West Beverly Hills High, where Annie Wilson (Shenae Grimes) and Dixon Wilson (Tristan Wilds) begin attendance. Their father, Harry Wilson (Rob Estes), returns from Kansas to his childhood home of Beverly Hills with his family to care for his mother, former television star Tabitha Wilson (Jessica Walter), who has a drinking problem. Annie and Dixon struggle to adjust to their new lives while making new friends and adhering to their parents' wishes. 90210 features cast members from the original series; featured guests include Jennie Garth, Shannen Doherty, Tori Spelling, Joe E. Tata, and original series recurring cast member Ann Gillespie.

Source: Wikipedia.org