Gladiator can fly at speeds rivaling those of starships, and can achieve faster-than-light speeds in hyperspace. He can survive unprotected in the vacuum of outer space, being able to go long periods of time without needing to draw breath. Thanks to his incredible lung capacity, Gladiator is also able to draw in large amounts of air and then expel it all to create a gale force wind. Gladiator can also project intense beams of heat from his eyes that can reach temperatures comparable to those produced by stars, as well as microscopic vision that lets him see beyond the sub-atomic barrier.
That's just some of Gladiator's powers and abilities.
Plus Sentry is on his side.
Gladiator and Sentry take this.
The Flashes die like they do every "Final" Crisis. 😄