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Looking to watch The Big Bang Theory Season 4 Episode 20 online? TV Fanatic is your destination for every paid and free streaming option of the The Big Bang Theory S4E20 full episode from 2 affiliates.

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Episode Details

The Big Bang Theory Season 4 Episode 20: "The Herb Garden Germination"

Sheldon and Amy spread gossip this week. Elsewhere, Howard takes a big step in his relationship with Bernadette.