Much to Katie's dismay, Anna-Kat becomes best friends with Chloe Brown Mueller's daughter, Penny. When Katie takes extreme measures to avoid Chloe and keep the girls apart, Anna-Kat and Penny are forced to take matters into their own hands. Meanwhile, Greg encourages Oliver to be honest with his girlfriend and not hide his passion for ballet.

The extraordinary musical episode includes four original songs by renowned composer Justin Paul and Glenn Slater, as well as choreography from famed choreographer Ashley Wallen. Frustrated by the lack of appreciation for all she does, Katie decides to go "full Westport" and leaves the family to fend for themselves. Katie's plan quickly backfires when the kids seem to be doing just fine, leaving Greg to suffer the brunt of her absence.