Dunder Mifflin holds a Casino Night in the warehouse to benefit charity. While Michael faces the task of juggling two dates, Jim is forced to ponder the reality of transferring to the Stamford branch and what that means for his relationship with Pam.
It’s still Marshall and Lily’s big wedding day but now we’re at the reception. Robin tries to tell a story but keeps getting interrupted. Barney tries his hardest to figure out Ted and Robin’s secret.
Leonard is torn between being honest or self-serving when Stuart asks his advice for an upcoming second date with Penny. Wolowitz realizes there’s a crucial error in a toilet he designed for the International Space Station.
Reaching the end of her rope, Bree checks herself into the Fairview psychiatric hospital. Lynette suspects that Tom is cheating on her, so she follows him to Atlantic City. Susan must start over. Felicia Tilman has more in store for Paul Young, resulting in their war reaching its final battle. Gaby and Carlos get Xiao-Mei pregnant.
In the first part of the two-hour season finale, things heat up between Lucas and Brooke after they head to New York for an overnight stay with Haley. Peyton is elated when she gets Jimmy Eat World to perform at TRIC just in time for Jake’s release from jail. Meanwhile, Andy invites Karen to spend the summer with him in New Zealand.
In the second part of the two hour season finale, Lucas and Brooke make a sizzling connection after he finally admits his true feelings for her. Nathan and Deb conspire to desert Dan for good, leading to an explosive conclusion when he discovers their plan. Meanwhile, a long-buried family secret is destined to rock Peyton’s world. And at the climax of Dan’s numerous deceptions someone sets the dealership on fire… with him in it.
J.D. and Turk’s college buddy Spence drops by for a visit and accidentally tells Dr. Cox a secret. Too much partying with successful Spence causes Turk and J.D. to show up late and drunk for work, which Dr. Cox fully reprehends them for.
Elliot’s feeling low since she can’t measure up to Dr. Kelso’s standards, and the Janitor starts another feud – this time over paychecks – with J.D.
Dr. Walden comes out of a coma with super-powers and a desire to kill Clark, piquing the Luthors’ interest. The spaceship starts talking to Clark, and Helen and Lex prepare for their wedding.
Michael tries to save his brother and himself from the unstoppable Mahone. Kellerman’s testimony at Sara’s trial proves different from what was expected. Sucre puts everything on the line to save Maricruz. Just like old times, T-Bag and Bellick are at it again.
Melinda visits the Mayor of Grandview and asks him to cancel the memorial dedication they are holding. She speaks to the ghost of a mail person and is looking for a young girl named Kristen. Later, Melinda and Professor Payne search for missing children after their Nanny says that they left with a man named Gabriel. A mysterious man tries to get Melinda to stop helping the good guys.
Georgina returns to the Upper East Side but it’s not the same Georgina we all knew, she’s changed. Chuck and Nate relationship is at a crossroad because of their mutual interest in Blair. Serena relationship with Gabriel get’s more complicated.