The Alien Parasite Hypothesis
🎞️ S4 E10 🤔 Caution

The Big Bang Theory

Is The Big Bang Theory S4 E10 OK for kids?

The Alien Parasite Hypothesis

Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

📺 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

Preview first — about 10+

The Big Bang Theory S4 E10, “The Alien Parasite Hypothesis”, scores 1/5 for violence, 3/5 for sex and 2/5 for language, for an overall kid-rating of 3/5 — Preview first — about 10+. Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

Across the episode we counted 6 flagged moments in 2 themes: Sex & hookups (4); Nudity & bodies (2). 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+

Nudity, sex talk, mild language in live-action sitcom.

Parents need to know that The Big Bang Theory S4 E10, "The Alien Parasite Hypothesis", is a live-action sitcom episode. The series is known for more innuendo than the science jokes suggest, but rarely explicit. Sits in the gray area mainly on nudity & bodies (explicit, in dialogue). Sexual content includes Sheldon says, "Forget science. She’s horny"; Amy says, "Let’s look at this logically. I have a stomach, I get hungry. I have genitals, I have…". Some mild language appears in the dialogue. 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 4 moments

How Sex & hookups shows up in The Big Bang Theory S4 E10:

  • Caution
    Sheldon Forget science. She’s horny.
  • Mild
    Sheldon …hosting an alien parasite or, and I only include it for the sake of covering absolutely all bases, sexual arousal.
  • Mild
    Amy I think we need to face the cold, hard truth, I was sexually aroused by Penny’s friend Zack.
  • Mild
    Sheldon I’d like to know if you’d be interested in having sex with Amy Farrah Fowler.

Nudity & bodies 2 moments

How Nudity & bodies shows up in The Big Bang Theory S4 E10:

  • Too much
    Amy Let’s look at this logically. I have a stomach, I get hungry. I have genitals, I have the potential for sexual arousal.
  • Mild
    Raj Oh, yeah? What if the earth was in danger and the only way to save it was to take a shower in the locker room and let other guys see you naked?

What to watch in The Big Bang Theory · Season 4 guide

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