Powers/Abilities (X):
After the events of Zero Hour, Impulse and Atom were infused with chronal energies which were continuously de-aging them-- the chronal energies within Atom were unstable and threatened to unravel time itself:
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The de-aging process accelerates. Waverider stops time completely, takes Impulse/Atom back in time to a millisecond before they were infused with chronal energy, and [re]fuses them with accurate versions of themselves (essentially the same trick he used on Parallax):