In February 2007, a forum member on BevNet posted a topic about a new beverage named Mountain Dew Clash. This was accompanied by some very poor quality photos of the bottle.
Per the posting, he wrote "I have a 2 sample bottles of what could be a new Mountain Dew line extension. It's called Mountain Dew Clash. I think it is supposed to be berry-flavored." Apparently, the beverage was provided as some type of test marketed, evidenced by the number affixed to the product sample, and may have been previously rumored under the names "Blue Surge" or "Phoenix". I've digitally-enhanced the photos for clarity.
Later in the discussion topic, an actual review was posted by the same author:
Ok here is my review of Clash,
The first smell and taste reminded me of something, then I realized what it was – Pepsi Blue – it had that type of blueberry taste to it. It also did not really have any mountain dew taste too it at all. It was sort of a light blueberry citrus taste. It also seemed to have a little more carbonation than regular Mt. Dew. It was not very sweet, and the flavor was not very strong.
Overall I thought it was OK, not that good though, it's werid it really did not have a mountain dew taste to it. More like a light pepsi bluish blueberry with a little citrus flavor.
The main thing I liked about it was it was not overly sweet and seemed to have extra carbonation.
Since the original postings in February 2007, no new news has been reported about Mountain Dew Clash.