Having gone their separate ways since the series "Beverly Hills, 90210" ended 19 years ago, the cast reunites at a 30th Anniversary fan convention in Las Vegas, causing old flames, feuds and feelings to reignite. At the end of the weekend, Tori suggests that they get a 90210 reboot off the ground.
When FOX greenlights a 90210 reboot, on the condition that seven of the original "Beverly Hills, 90210" cast members get on board, Tori and Jennie confront each of their former castmates and are met with more resistance than they had anticipated. Meanwhile, the gang deals with the repercussions of their actions in Las Vegas, Shannen gets a call from a friend and former "Beverly Hills, 90210" costar Christine Elise pops back into their lives.
Tori starts to feel the pressure of balancing the cast's requirements for the reboot, while keeping the wheels in motion. Jason and Ian both struggle with their marriage issues, Jennie meets her new bodyguard, Brian hires a new assistant and Gabby asks Christine for advice. Meanwhile, the cast turns to a familiar face for help and Tori goes to extremes to get Shannen on board with the reboot.
The fan reaction from the release of the first cast photo has the gang riding high, until the table read serves up major disappointment. The cast bands together to try to rewrite the script, but can't come to an agreement on storylines. Meanwhile, Shannen questions her decision to join the reboot, Jennie lets Kyler audition for a role and Brian learns some shocking information about Zach.
When the first day of filming is halted amidst the latest threat, the cast makes a list of their potential enemies and sets their eyes on a former co-star who may be holding a vendetta against them. Jason's insensitivity while directing, causes the ladies to become frustrated and Tori stresses over an upcoming sex scene with Brian. Meanwhile, both Gabby and Brian share some personal news with the cast.
As the cast celebrates the wrap of the pilot, the looming news of a pick-up from FOX keeps them all on edge. Ian realizes his relationship with Anna might be a little too casual, Jennie thinks Wyatt might be in too deep, Tori gets frustrated with Nate, and Shay drops a major bombshell on Brian. Meanwhile, Jason and Camille come to a realization about their marriage, Gabrielle introduces her husband to Christine, and Shannen stresses over the future.