"The Zazzy Substitution"

The focus of this week's episode: Sheldon's search for an alternative to human companionship. Read on to see how that goes.

  • 3.5 / 5.0
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"The Cruciferous Vegetable Amplification"

By the time he downloads his consciousness into a robot body, Sheldon realizes he'll be long gone. As a result, he attempts to make himself live longer.

  • 3.5 / 5.0
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"The Robotic Manipulation"

Penny tags along for Sheldon's first date on the fourth season premiere. Elsewhere, Wolowitz discovers a new use for a robotic arm.

  • 3.5 / 5.0
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"The Lunar Excitation"

Blossom alert! Former sitcom star Mayim Bialik guest stars on the season finale as a potential love interest for Sheldon.

  • 4.0 / 5.0
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"The Staircase Implementation"

Leonard tells Penny the story of how the apartment elevator broke through a series of flashbacks.

  • 4.5 / 5.0
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"The Plimpton Stimulation"

Sheldon has a female physicist, Dr. Plimpton (Judy Greer) spend the night at the apartment.

  • 4.0 / 5.0
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"The Spaghetti Catalyst"

After Penny and Leonard break up, Sheldon goes behind Leonard's back to hang out with Penny.

"The Wheaton Recurrence"

Sheldon goes up against his nemesis, Wil Wheaton at the bowling alley while Leonard and Penny have their own fight.

  • 3.5 / 5.0
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"The Pants Alternative"

When Sheldon is forced to give an acceptance speech for an award he received, he must overcome his stage freight.

  • 3.5 / 5.0
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"The Precious Fragmentation"

When the guys buy a Lord of the Rings ring from a garage sale, they all begin to covet their precious.

  • 5.0 / 5.0
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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.