ANSWERS: 2
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It is called: Genesis. The episode where the crew de-evolve into prehistoric beings. http://www.startrek.com/startrek/view/series/TNG/episode/68648.html That eel was Deanna Troi.
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locutus has the episode right. However, it was not caused by the crew eating bad food. It was caused by Dr. Crusher accidentally creating the condition by treating a genetic disorder that Lt. Barclay had. However, instead of turning on a set of genetic instructions that was supposed to be operational, it turned all of them on (DNA actually has a lot of inactive information, held over from evolution). The condition became known as "Barclay's Protomorphosis Syndrome".
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