Sheldon's latest scientific breakthrough leaves him feeling like a fraud, and a romantic gesture causes Penny to up her game.
Tool Time continues to be a "jewel" despite the continued excess presence of the Binford name. Things rapidly turn sad when Al decides to take his mother out to dinner to tell her he's going to get married... and she has a heart attack and dies.
Ellenor leads Eugene and Lucy in an effort to allow a new DNA test that may keep Stuart Donovan from death row; Rebecca helps an elderly couple.
Ellenor makes a last argument for Stuart Donovan after shocking new evidence is revealed; Bobby and Lindsay battle over wedding plans.
When Kat winds up getting sick days before her favourite TV newsman plans a visit to the café, she turns in to her alter ego, Katzilla.