The Unidentified Dagger Blue Soldier was a Blue Soldier on the Blue team in Battle of the Brick: Built for Combat - The Movie. He appeared when some Red Soldiers attempted to steal the Blue flag after their flag bearer

The Soldier

had been shot. When a Red Soldier was about to steal the flag, the Soldier ambushes him and stabbed him with a chrome dagger. He was then blown up by a bomb thrown by a Red Soldier.