Left Brain was what Zaphod Beeblebrox called his left head after he had it removed and hooked it up to the computer of the Heart of Gold. It appeared to be much smarter and more rational than either Zaphod's remaining head or it was when it was still attached to Zaphod's body.

In Fit the Twenty-Eighth, he sang The Teleportation Blues at the Heart of Gold karaoke night.

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Hexagonal Phase

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