The Big Bang Theory Season 4 Episode 10

The Alien Parasite Hypothesis - All Season 4 episodes

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Show Details

Directed by: Mark Cendrowski

Story by : Chuck Lorre & Steven Molaro & Steve Holland

Teleplay by : Lee Aronsohn & Jim Reynolds & Maria Ferrari

Original air date: December 9, 2010

While on a girls’ night out with Penny and Bernadette, Amy meets Penny’s ex-boyfriend Zack and immediately becomes attracted to him. She later discusses her symptoms with Sheldon (elevated heart rate, moist palms, dry mouth, vascular throbbing in the ears and genitalia and saying an involuntary “hoo” in Zack’s presence) and comes to the reluctant conclusion that she is sexually aroused by Zack, though Sheldon prefers to assume that Amy has contracted an alien parasite. Amy also points out that Sheldon might be jealous, which Sheldon denies, but doesn’t confirm whether he is actually suppressing it when Amy asks him. Later when Sheldon discusses about Amy and Zack with Penny, Penny tells him that there is “something” he could do about Amy’s “urges”, but as usual he misunderstands what Penny is trying to say to him (Penny meant that Sheldon should show romantic feelings to Amy) and instead tries to bring Amy and Zack together, believing Zack is sexually superior to him. He manages to contact the right Zack Johnson and sets him up on a date with Amy at a bar. This proves to be a failure, as Amy finds out that Zack is extremely stupid, which turns her off. Later while walking home with Sheldon, Amy does something she never did before – she holds Sheldon’s hand. When Sheldon asks why Amy is holding his hand, Amy says it is just an experiment, but then lets go and says, “Nope. Nothing. Never mind.”, indicating that she is not attracted by Sheldon’s appearance, yet chose Sheldon’s intellect over Zack’s looks. Meanwhile, after one of the scientists at the biology lab is bitten by a radioactive rat, Howard and Raj argue about who would be the better superhero (with Raj expressing his desire to be “Rat-Man”). Knowing that Raj is afraid of spiders, Howard proposes a contest where the first person who dares to put his hand into a jar with a huge spider in it and keeps it there for the longest time gets to be the superhero. This however backfires, as the spider crawls onto Howard’s arm, freaking him out. The duo decide to settle their argument once and for all by having a wrestling match, but this too fails as instead of wrestling each other, they only end up circling and insulting each other.

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