Gabi is feeling down about her birthday, even after she discovers she and Ms. Wilson share their special day. When Gabi learns Ms. Wilson made a promise to meet a former boyfriend (special guest star Carl Reiner) in Vegas, she decides a road trip to Sin City is the perfect way to get over her birthday blues. Meanwhile, Josh is desperate to figure out why Gabi is so upset about her birthday, and Yolanda and Elliot scheme to keep Gabi's forgotten birthday gifts.

Gabi is horrified when Josh doesn't remember her after a bump on the head, especially since he seems to remember everyone else – and he was about to tell her something important. When Josh thinks he and Gabi met right before his accident at her audition to be his chef, Gabi sets out to recreate their first meeting in the hopes of jogging his memory.