As the cast celebrates the wrap of the pilot, they nervously await news from the network. 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.

The first day of filming is halted due to a threat; the cast sets their eyes on a former co-star who may be holding a vendetta against them; Jason's insensitivity while directing causes frustration; Tori stresses over an upcoming sex scene.

When 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; Shannen questions her decision to join the reboot.

Tori starts to feel the pressure of balancing the cast's requirements. Jason and Ian both struggle with their marriage issues. Jennie meets her new bodyguard. Brian hires a new assistant. Gabby asks Christine for advice.

When FOX greenlights a reboot, Tori and Jennie confront each of their former castmates and are met with more resistance than they had anticipated. The gang deals with the repercussions of their actions in Las Vegas.

Having gone their separate ways since the series "Beverly Hills, 90210" ended 19 years ago, the cast members reunite at a 30th anniversary fan convention in Las Vegas, causing old flames, feuds and feelings to reignite.