Guy Gilbert makes that suit work.

It's mechanism, triggered by the dial on his chest, speeds up everything for Guy.

Lightning in a bottle.

His top speed is really unknown. While the suit multiplies his speed, it also has a deadly drawback:

It also multiplies his metabolism. Every time Guy uses the suit and becomes Lightning, the suit ages every cell in his body.

Some people shorten their lifespan by smoking tobacco. Guy has shortened his by wearing the suit.

The fastest man on Earth.

Running away from his own demise.

The faster he runs, the faster his doom chases him.