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Season guide

The Big Bang Theory: Season 11

24 episodes Premiered Sep 25, 2017 Updated Oct 3, 2026

The eleventh season of The Big Bang Theory continues the narrative arc of the series, which explores the lives of physicists Leonard Hofstadter and Sheldon Cooper. The show, created by Chuck Lorre and Bill Prady, centers on a social circle that includes friends Howard and Raj, as well as Penny, an aspiring actress who moved into the apartment across the hall. Throughout the series, the group navigates the complexitie

Previously on The Big Bang Theory

Season 11 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ The series follows the lives of two brilliant but socially awkward physicists, Leonard and Sheldon, living in Pasadena, California.
  • ⚡ The core social circle expanded to include their friends Howard and Raj, as well as their neighbor Penny, an aspiring actress.
  • ⚡ Penny's arrival introduced the physicists to experiences outside of their laboratory environment, challenging their limited social perspectives.
  • ⚡ Sheldon Cooper, who historically focused on his own interests, developed a significant romantic relationship with Amy Farrah Fowler.
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Season overview

The eleventh season of The Big Bang Theory continues the narrative arc of the series, which explores the lives of physicists Leonard Hofstadter and Sheldon Cooper. The show, created by Chuck Lorre and Bill Prady, centers on a social circle that includes friends Howard and Raj, as well as Penny, an aspiring actress who moved into the apartment across the hall. Throughout the series, the group navigates the complexities of life outside the laboratory, often highlighting the contrast between their scientific brilliance and their social awkwardness. In this specific season, the narrative focuses on the evolution of the relationship between Sheldon and Amy Farrah Fowler. After years of Sheldon primarily looking out for himself, he finds in Amy the most patient woman to ever walk the earth. Following a significant milestone in their relationship, the season is defined by a sense of wedding fever that permeates the group. As the characters continue to grow, the season builds upon the established dynamics of this Pasadena-based ensemble, balancing their long-standing intellectual pursuits with the personal developments and romantic milestones that have become central to their lives over the course of the show's multi-year run.

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Season 11 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 11 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 11: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

21%
79%
Mytharc (5): Crucial lore & season climaxes
Core (19): Character development & subplots
Side Quest (0): Standalone / filler
S11·E1 Mytharc

The Proposal Proposal

Sep 25, 2017 · 21 min

In the eleventh season opener, Amy gives Sheldon an answer to his proposal while Howard and Bernadette struggle with some unexpected news.

S11·E2 Core

The Retraction Reaction

Oct 2, 2017 · 21 min

Leonard angers the university – and the entire physics community – after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sh

S11·E3 Core

The Relaxation Integration

Oct 9, 2017 · 20 min

Sheldon and Amy struggle with picking a wedding date, which stresses out Sheldon and causes him talking in his sleep. Meanwhile, Raj and Stuart fight over the attention of one of B

S11·E4 Core

The Explosion Implosion

Oct 16, 2017 · 21 min

As Howard worries about fatherhood, he and Sheldon bond when they jointly assemble a model rocket. Meanwhile, Penny bonds with Leonard's mother, Beverly, much to his concern.

S11·E5 Core

The Collaboration Contamination

Oct 23, 2017 · 19 min

Sheldon and Raj confide in Bernadette when they can't handle Amy and Howard working together on a science project. Also, Penny and Leonard learn new tactics for how to deal with Sh

S11·E6 Core

The Proton Regeneration

Nov 2, 2017 · 21 min

Sheldon goes head-to-head with Wil Wheaton for the role of the new Professor Proton. Also, Penny steps in to take care of Halley when Bernadette and Howard both wind up on bed rest

S11·E7 Core

The Geology Methodology

Nov 9, 2017 · 20 min

Sheldon and Bert collaborate on a research project, despite Sheldon’s embarrassment. Also, Penny and Bernadette coach Raj on how to navigate his relationship with Ruchi.

S11·E8 Core

The Tesla Recoil

Nov 16, 2017 · 19 min

Leonard and Howard are furious after they learn Sheldon went to work with the military behind their backs. Also, while Bernadette is on bed rest, she asks Raj to do some digging wh

S11·E9 Mytharc

The Bitcoin Entanglement

Nov 30, 2017 · 19 min

Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable Bitcoin investment. Also, a seven-year-old video reveals a secret about Leonard and Penny'

S11·E10 Core

The Confidence Erosion

Dec 7, 2017 · 21 min

Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Also, Raj “breaks up” with Howard after realizing his best friend is actually hurting

S11·E11 Core

The Celebration Reverberation

Dec 14, 2017 · 20 min

Raj and Howard's feud continues as the gang plan Halley's first birthday party. Sheldon's surprise for Amy's birthday goes awry when they get food poisoning. Also, Leonard gets a C

S11·E12 Core

The Matrimonial Metric

Jan 4, 2018 · 20 min

Sheldon and Amy try to pick their Best-Man and Maid of Honor by experimenting on the gang.

S11·E13 Core

The Solo Oscillation

Jan 11, 2018 · 21 min

When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon,

S11·E14 Core

The Separation Triangulation

Jan 18, 2018 · 19 min

Raj finds himself in the middle of domestic drama when he learns the woman he's dating, has a very upset husband. Also, when Sheldon rents his old room back for a quiet place to wo

S11·E15 Core

The Novelization Correlation

Feb 1, 2018 · 21 min

Leonard's book raises questions, and Amy guest stars on the new Professor Proton show.

S11·E16 Mytharc

The Neonatal Nomenclature

Mar 1, 2018 · 19 min

When Bernadette won't go into labor, the gang tries different tactics to get things started. Also, Howard confronts Bernadette after Amy accidentally reveals she's already chosen t

S11·E17 Core

The Athenaeum Allocation

Mar 8, 2018 · 20 min

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Also, Bernadette and Howard have a hard time deciding who should stay at home with the kid

S11·E18 Core

The Gates Excitation

Mar 29, 2018 · 20 min

Bill Gates visits Penny's work, and the gang schemes to meet him. Hilarity ensues. Meanwhile, Sheldon is convinced that he's a target of an April's Fools prank.

S11·E19 Core

The Tenant Disassociation

Apr 5, 2018 · 21 min

When Leonard learns Sheldon is the president of the tenants association, he decides to run against him. Also, Bernadette encourages Howard and Raj to find the owner of a drone afte

S11·E20 Core

The Reclusive Potential

Apr 12, 2018 · 21 min

A brilliant but reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere, and Leonard, Raj and Howard go along for the trip. Also, Penny and Berna

S11·E21 Core

The Comet Polarization

Apr 19, 2018 · 20 min

Sheldon’s comic book store experience changes when writer Neil Gaiman puts Stuart’s store on the map. Also, friendships are threatened when Raj takes credit for Penny's astronomica

S11·E22 Core

The Monetary Insufficiency

Apr 26, 2018 · 19 min

Sheldon goes to Vegas to win money for science. Also, Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.

S11·E23 Mytharc

The Sibling Realignment

May 3, 2018 · 20 min

When Sheldon learns that his mother won’t attend his wedding unless he invites his brother, Georgie, he and Leonard travel to Texas to end a family feud. Also, the Wolowitz kids in

S11·E24 Mytharc

The Bow Tie Asymmetry

May 10, 2018 · 22 min

When Amy's parents and Sheldon's family arrive, everybody is focused to make sure all wedding arrangements go according to plan – everyone except the bride and groom.

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