Traitors (Ancient Warriors) (Volume 2)

"Prepare for a rematch." GroThar's words reverberated in Mark's head. He looked at the cubes in his hands. One red, one green, and one blue. He had learned so much about them. And yet felt that there was more to know. Then he looked across the skyline-somewhere up there, somewhere GroThar was waiting, but Mark knew he would return soon to make good on his promise. "Come on back! I'm ready!" Mark shouted. But he knew he wasn't.