Jerri's now beautiful fashion-photographer sister Celeste develops a plan to get back at Wendell, who incessantly taunted her when she was a homely high-schooler. Meanwhile, T.K. promises to help the kids with a science project but gets sidetracked by Jesse's comely sister Vivica.

Jerri's sister Celeste pays a visit and unintentionally strains Robert and Jerri's marriage with her extravagant suggestions for their 20th-anniversary party and Zaria and T.K. find themselves riding to the rescue.