A self-proclaimed hater of change, Kim is horrified by the prospect of turning 40. While Kroy tries to convince Kim to celebrate the occasion in style, they grapple with a frightening health issue, a shocking announcement from Brielle, and the emergence of a long-lost figure from Kim's past.

The moment Kim never believed would arrive is here: Brielle's move out day. Can Kim cope with the new Brielle-sized hole in her heart as her six children grow up too fast around her? And when Ariana tries her hand improv comedy, she's not sure the acting thing is really her scene.