CBS | 9:30 pm

After years of playing tragic story lines as multiple characters on "The Vampire Diaries," Nina Dobrev switches gears to comedy for her role as Clem, who grew up in a dysfunctional household but now is happy with a college professor fiance (Tone Bell) and his approving parents (Sheryl Lee Ralph, Brian Stokes Mitchell). When her loose-cannon half-sister Shannon (Odessa Adlon, daughter of Pamela) unexpectedly shows up, however, Clem invites her to move in.