Elizabeth opens the show and, to the audience’s shock, announces she is leaving Supper at Six effective immediately. Walter, watching from the producer’s chair, recalls being struck by her confidence when they first met, and struggles to keep composed as the studio reacts.

A flashback to the previous night shows Elizabeth arriving unannounced at Walter’s home with Madeline and Six-Thirty in the car. She discovers Walter and Harriet are together and, after initial surprise, declares she will quit the show the next day. The finality of Elizabeth’s decision moves both Walter and Harriet to tears, and they embrace.

Back on air, Elizabeth explains she is returning to scientific research and thanks viewers for their friendship and shared accomplishments. She shares an update about Mrs. George (Marjorie) Fillis, now accepted to medical school, and writes Chemistry is Change, launching into a speech about courage, self-determination, and rejecting limiting labels.

Elizabeth publicly thanks Harriet Sloane for the advice that led her to “recommit,” asks children to set the table one last time, and urges women to challenge the status quo. As the audience refuses to let the moment end, Walter cues a final line; Elizabeth closes: the introduction to chemistry is over—class dismissed.