Makkari uses her cosmically powered super-speed to scout planets, and as the only deaf Eternal, she is not affected by the sonic boom that accompanies her cosmic running.

The Eternals are a race of immortal aliens from a distant planet who arrived on Earth thousands of years ago to protect humanity from a race of alien predators called Deviants. The Eternals were alerted to the Deviant threat by the Celestials, a race of cosmic builders whose fingerprints are on the very building blocks of life itself!