At the all night graduation lock-in party, graduates set out to fulfill their unfinished business. For many, it’s their last chance to live their high school dreams, but things inevitably take a turn for the Senior Class of Sherman Grove High School.
A last minute arrival at Grad Night causes a stir as students create videos predicting where they will be in 20 years. Deanna vows to tell Fig her true feelings while Roni’s friends try to convince her there is another reason why Oz is pulling away.
As karaoke commences, Roni makes a huge announcement only to be topped by the revelation of an even bigger secret. Bryce begins to lay the groundwork for his seduction of the gym teacher’s wife. Christian urges Melinda to come out of her shell.
The stroke of midnight means it’s time for Midnight Madness, a crazy game that ends up amplifying the bad blood between Deanna and Cassie. Roni, Alexis and Lyssee plot their revenge on Oz and Melinda makes a plan to acquire more alcohol for the party.
The night takes a turn as 80s themed jello wrestling pits students against each other. Fig finally gets to talk to Roni, as Deanna confesses her feelings. Christian and Melinda sneak out to steal alcohol. Bryce discovers the key to Mrs. Lewis’ heart.
As half the students fall asleep, Nino’s music livens things up. Melinda misjudges a moment between her and Christian. Cassie helps Deanna go through an emotional and cosmetic make over and Bryce coerces Mrs. Lewis to sneak away.
Things get hot and heavy between Roni and Fig while Melinda is banished to grad night detention. Alexis and Cassie find themselves at crossroads as Deanna and Nino get to know one another. Bryce may not be up to the challenge of sleeping with Mrs. Lewis.
Tarot card readings complicates everyone’s night sending Fig, Deanna, Jonas and Stymie into uncharted territory. Melinda tries to convince Saperstein to let her out. Cassie and Alexis hash out their issues while Cody and Stefania argue about their pasts.
Stefania helps Cody re-do a moment from his past while Lyssee challenges Roni and Alexis to a streaking adventure. Deanna helps Nino cross one more thing off his list as Fig makes a big decision. Stymie and Jonas get close to finding their elusive queen.
Friends and lovers have one last chance to reunite before the last minute of grad night ticks away. Cassie and Deanna devise a plan to win Alexis back while Roni reveals to Deanna the reason why she and Fig broke up. And Melinda makes a bold move.