Writer Mark Waid expanded on the character's powers thematically and further redefined the character by introducing the Speed Force, an energy source that served as a pseudo-scientific explanation for his powers and that of other fictional speedsters within the DC Universe. Using this concept as a basis, the character's ability to tap into the Speed Force was used to expand his abilities. The character was now able to lend speed to other objects and people and create a costume directly out of Speed Force energy. Traditional powers such as the ability to vibrate through solid objects were also restored. Because of this, the Flash felt pressured into having to constantly be heroic 24/7. During this time, he joined the latest incarnation of the Justice League.