They are the ones who are usually feared. They are people with superpowers. But they use their abilities not to harm humanity, but to protect them. They are a secret group of mercenaries from different eras who are called in at times when humanity is in grave danger. Under the command of Andy, they have protected people from all sorts of threats for centuries. One day they go on another mission to eliminate another threat. During the mission, they learn about the existence of another immortal warrior. It soon becomes clear that the secret of the immortal guard has been revealed. There were those who decided to copy the gift of the immortals. Together with the newly-minted "immortal", they will have to come up with a plan to destroy the threat to their group.