Derek starts up a relationship with Rebecca, Karen decides between 'Bombshell', or staying with her boyfriend, and Julia and Eileen argue about rehiring Michael Swift.
Karen becomes best friends with Rebecca Duvall (guest star Uma Thurman). Meanwhile the tension between Tom and Derek rises.
The arrival of Rebecca Duval does not go well and "Bombshell" is turned upside down. This leads to Ivy and Karen to try and overcome their history as they unite against their new rival. Meanwhile, Tom and Sam's blossoming romance heats up.moreless
As Tom and Julia celebrate their anniversary, Marilyn's new leading lady Rebecca Duvall (Special Guest Star, Uma Thurman) gets stranded in Cuba which, leads to Derek asking Karen to fill in.