The Line Substitution Solution
🎞️ S9 E23 ✅ Mild

The Big Bang Theory

Is The Big Bang Theory S9 E23 OK for kids?

The Line Substitution Solution

Sheldon hires Stuart to spend the day with Amy when he'd rather go to a movie screening. Also, Leonard's mother, Beverly, comes to town and Penny struggles to make a connection with her.

📺 Where to watch

Netflix, HBO or Disney+ — catalogs differ by country.

NetflixHBODisney+

🛒 Where to buy

Digital seasons or a box set to keep.

AmazonApple TVGoogle Play

Content guide

👊 Violence
💋 Sex
🙊 Language
⭐ Overall

Mild — okay from about 10+

The Big Bang Theory S9 E23, “The Line Substitution Solution”, scores 1/5 for violence, 2/5 for sex and 1/5 for language, for an overall kid-rating of 2/5 — Mild — okay from about 10+. Sheldon hires Stuart to spend the day with Amy when he'd rather go to a movie screening. Also, Leonard's mother, Beverly, comes to town and Penny struggles to make a connection with her.

Across the episode we counted 3 flagged moments in 3 themes: Sex & hookups (1); Affairs / cheating (1); Violence & injury (1). Every moment below is either a direct quote from the episode transcript or a short description of what happens on screen, so you can decide before you press play.

Parents need to know

Age 10+

Affairs and cheating, sex talk, violence in live-action sitcom.

Parents need to know that The Big Bang Theory S9 E23, "The Line Substitution Solution", is a live-action sitcom episode. The series is known for more innuendo than the science jokes suggest, but rarely explicit. Scores low: the strongest thing we found is affairs / cheating (moderate, in dialogue). Violence is mild but includes Howard says, "I can’t believe we’re gonna get beat up, and it’s not because of your chair". Sexual content is mild but includes Penny says, "Well, I’d actually like for us to be close, but maybe we start with our favourite books…"; Sheldon says, "Well, what a sad state of affairs. That you’ve all been so ground down by life, you…". Every flagged moment below is a direct quote from the transcript or a short description of what happens on screen.

Watch for — every moment, theme by theme

Sex & hookups 1 moment

How Sex & hookups shows up in The Big Bang Theory S9 E23:

  • Mild
    Penny Well, I’d actually like for us to be close, but maybe we start with our favourite books and work our way up to my husband’s sex organs.

Affairs / cheating 1 moment

How Affairs / cheating shows up in The Big Bang Theory S9 E23:

  • Caution
    Sheldon Well, what a sad state of affairs. That you’ve all been so ground down by life, you don’t even notice when someone disrespects you.

Violence & injury 1 moment

How Violence & injury shows up in The Big Bang Theory S9 E23:

  • Mild
    Howard I can’t believe we’re gonna get beat up, and it’s not because of your chair.

What to watch in The Big Bang Theory · Season 9 guide

Watch With The Kids · Your kids — your rules! · Informal parent guidance, not an official rating.