Power Rangers Unlimited: The Death Ranger #1

THE LEGENDARY OMEGA RANGERS defended the universe from evil thousands of years ago, the six of them using their elemental powers to protect others from sinister forces.
But that all changed when one key member turned on the others, seduced by the death-defying powers of the Rangers’ greatest foe.
How does this Ranger connect to what’s locked in the mysterious Omega Vault in Safehaven so many millennia later, as everything converges in the highly-anticipated CHARGE TO 100?