The Super 4: Dark Death

In the first book of the epic the Super 4 series, four teenagers, Harrison, Jake, Carly and Darryl, embark on an adventure of lifetime, when during a mountain walk, they find themselves lost and thirsty. That's when they stumble across a lab. It was a miracle.
Vending machines lined up the wall. They drink as many sodas as they can.
The left feeling powerful.
Though they still faced life's natural problems; bullying, grades and fights, they felt confident and powerful.
Then, havoc started wreaking in their lives. All hell broke loose. Family problems, personal problems, friend problems.
They discover the person behind all this, one they nicknamed, the Shadow, and knew that problem had to be solved.
With no knowledge of who the Shadow really was, the teenagers fight for their lives.
But can they defeat darkness?