Will, Karen and Jack unknowingly take a hallucinogenic drug, which causes Will and Jack to wonder if they're each other's soul mate and has Karen giving her last "performance" as Mrs. Stanley Walker. Meanwhile, Grace is shocked when her high-powered client takes up with her sister Janet.

When Will discovers Karen's estranged stepdaughter Olivia is a student in his law class, he attempts to solve their issues with a mock trial. Grace and Jack go on a diet together, but giving up their eating habits proves harder than anticipated.