Diet Pepsi was a type of diet cola available to consumers on Earth in the late 20th century. This cola was produced by Pepsi-Cola. It differed from the original drink by replacing the sugar with an artificial sweetener to reduce the beverage's calories.

In 1986, a bus on the 30-Stockton route had an advertising sign for this beverage under the driver's window. (Star Trek IV: The Voyage Home)

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