Cherry is a Mountain Dew flavor first released as a flavor shot in a test market release of a touchscreen soda fountain machine called Pepsi Fusion (designed to compete with Coca-Cola's Freestyle machine) for a short period in 2010. In 2013, it was re-released once again in the Pepsi Spire machines, and it's since been available.
(2010) Pepsi Fusion test market release
In 2009, Coca-Cola released a touchscreen soda fountain called the Coca-Cola Freestyle. A year after, PepsiCo quickly responded with an equivalent touchscreen soda fountain called the Pepsi Fusion, designed to compete with Coca-Cola's Freestyle machine.
PepsiCo then conducted a test market release in 2010 in various restaurants for a short period of time. The flavors available in the Pepsi Fusion machine were Lemon, Lime, Grape, Orange, Cherry, Strawberry, Raspberry, and Wild Berry, eight flavor shots.
(2013 - Present) Pepsi Spire release
After Pepsi Fusion's test market release, PepsiCo decided to redesign Fusion's design into a simple modernized concept called Pepsi Spire, similar to the Coca-Cola Freestyle machines in styles and appearances in many ways.
In 2013, PepsiCo once again conducted a test market release throughout various restaurants for a short period. After the testing period, PepsiCo decided to release the Pepsi Spire machines launched fully to select national and regional restaurants, gas stations, and other franchises. The flavors available in the Pepsi Spire machine were Cherry, Vanilla, Strawberry, and Lemon, four flavor shots.