Sheldon proposes to Amy after the scare of almost losing her. The ring, the speech, the moment — it's everything fans hoped for.
Sheldon retracts a paper and the professional embarrassment is tough. Amy helps him process the failure.
The gang tries to relax after the proposal excitement. Finding the right pace between celebration and normal life proves tricky.
Howard bonds with his father-in-law over a model rocket and the experience is unexpectedly meaningful for both of them.
Amy and Sheldon encounter interference from a colleague working on a similar project. The professional rivalry gets personal.
Professor Proton appears to Sheldon in a dream and the torch is symbolically passed. A new generation of science communication begins.
Bert asks Sheldon for help with a geology project and Sheldon must overcome his disdain for rocks. Character growth is slow but real.
Howard and Leonard realize they've both been cheated by the same colleague. The revenge plan involves classic nerd ingenuity.
A bitcoin investment from years ago might have made the guys rich — if they can find the laptop. The treasure hunt is on.
Raj's confidence takes a hit and the gang helps rebuild it. The support system in this friend group really shines.
Bernadette's birthday celebration brings the group together. Howard plans something special despite being on a budget.
Sheldon and Amy create a wedding guest list and the process reveals who really matters to them — and who doesn't.
Raj gets a solo adventure when he takes himself on a date night. Learning to be alone is its own kind of growth.
Leonard's father visits and the family dynamics get complicated. Sheldon plays mediator, which is as effective as you'd expect.
Sheldon writes a novel and the gang's feedback is less than enthusiastic. His creative side meets honest criticism.
Howard and Bernadette debate baby names and the couple's different styles come through. The naming process gets competitive.
The gang visits a prestigious private club and the experience highlights their different comfort levels in formal settings.
Bill Gates visits the university and the guys compete for his attention. The tech mogul's cameo is a highlight.
A dispute between tenants in the building brings out everyone's inner lawyer. Sheldon's knowledge of bylaws is formidable.
Sheldon meets a reclusive scientist and the encounter changes his perspective on fame versus meaningful work.
Amy spots a comet and gets a taste of fame. Sheldon struggles with not being the one in the spotlight.
Financial stress hits one couple and the group discusses the awkwardness of money between friends.
Sheldon reunites with his brother Georgie and the visit stirs up old family dynamics. Reconciliation isn't easy but it's worth trying.
Sheldon and Amy's wedding day arrives with a perfect bow tie, touching vows, and a surprise guest star that makes the ceremony truly special.