Surge

Colonel Surge is a member of the Blues and Reds, a group of Simulation Troopers that are very similar to the Reds and Blues of Blood Gulch.

Role in Plot
He and the rest of his team perform terrorist attacks ten months following the Chorus-Charon War, seemingly in vengeance for the UNSC's actions towards Project Freelancer personnel.

He was the first to encounter his counterpart in Nightmare on Planet Evil, when he sees Sarge, who mistakes him as his reflection. He then tells his team that he has encountered them.

Trivia

 * With the rank of Colonel, Surge is, tied with Sarge and Turf, the highest ranking member of the Red Army and the third highest ranked character in the series, behind Donald Doyle, who is a general.