The Big Bang Theory backdrop
The Big Bang Theory S9E18 — The Application Deterioration
7.5
The Big Bang Theory•Season 9•Episode 18

The Application Deterioration

7.5/10 · 3,433 votesMar 10, 201618 min

Ranked #11 of 24 in Season 9•−0.1 vs season avg

Discussion

Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.

Directed byMark Cendrowski
Previous episodeE17 · The Celebration ExperimentationNext episodeE19 · The Solder Excursion Diversion
BestEpisodes
WorstEpisodes
BestSeasons
AllEpisodes

Seasons12

All123456789101112

Season 9 Episodes24

The Matrimonial Momentum stillE1 6.8

The Matrimonial Momentum

The Separation Oscillation stillE2 7.3

The Separation Oscillation

The Bachelor Party Corrosion stillE3 7.7

The Bachelor Party Corrosion

The 2003 Approximation stillE4 7.4

The 2003 Approximation

The Perspiration Implementation stillE5 7.4

The Perspiration Implementation

The Helium Insufficiency stillE6 7.2

The Helium Insufficiency

The Spock Resonance stillE7 7.9

The Spock Resonance

The Mystery Date Observation stillE8 7.9

The Mystery Date Observation

The Platonic Permutation stillE9 7.7

The Platonic Permutation

The Earworm Reverberation stillE10 8.3

The Earworm Reverberation

The Opening Night Excitation stillE11 9.0

The Opening Night Excitation

The Sales Call Sublimation stillE12 7.4

The Sales Call Sublimation

The Empathy Optimization stillE13 7.4

The Empathy Optimization

The Meemaw Materialization stillE14 7.5

The Meemaw Materialization

The Valentino Submergence stillE15 7.5

The Valentino Submergence

The Positive Negative Reaction stillE16 7.4

The Positive Negative Reaction

The Celebration Experimentation stillE17 7.6

The Celebration Experimentation

The Application Deterioration stillE18 7.5Now viewing

The Application Deterioration

The Solder Excursion Diversion stillE19 7.4

The Solder Excursion Diversion

The Big Bear Precipitation stillE20 7.4

The Big Bear Precipitation

The Viewing Party Combustion stillE21 7.4

The Viewing Party Combustion

The Fermentation Bifurcation stillE22 7.4

The Fermentation Bifurcation

The Line Substitution Solution stillE23 7.4

The Line Substitution Solution

The Convergence Convergence stillE24 7.8

The Convergence Convergence

Cast7

Johnny Galecki

Johnny Galecki

Leonard Hofstadter

Jim Parsons

Jim Parsons

Sheldon Cooper

Kaley Cuoco

Kaley Cuoco

Penny

Simon Helberg

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Kunal Nayyar

Rajesh Koothrappali

Melissa Rauch

Melissa Rauch

Bernadette Rostenkowski

Mayim Bialik

Mayim Bialik

Amy Farrah Fowler

Crew12

Maria Ferrari

Maria Ferrari

Executive Producer

Jim Reynolds

Jim Reynolds

Executive Producer

Eric Kaplan

Eric Kaplan

Executive Producer

David Goetsch

David Goetsch

Executive Producer

Mark Cendrowski

Mark Cendrowski

Director

Jim Reynolds

Jim Reynolds

Teleplay

Steven Molaro

Steven Molaro

Story

Eric Kaplan

Eric Kaplan

Story

Steve Holland

Steve Holland

Teleplay

A

Adam Faberman

Story

Maria Ferrari

Maria Ferrari

Teleplay

Steve Holland

Steve Holland

Executive Producer

Discussion

0 comments

Join the conversation

Share your take and reply to other fans.

No comments yet

Be the first to share your thoughts on this episode.

Episode Summary

"The Application Deterioration" is episode 18 of The Big Bang Theory season 9. It scored 7.5/10 from 3,433 votes, ranking #11 of 24 episodes this season (season average 7.6). Directed by Mark Cendrowski, it aired on March 10, 2016.

Next: E19 · The Solder Excursion DiversionBest of Season 9