Night of the Karrion: Part 3 of 3. "Check and Mate!" Guest-starring Checkmate, Sargent Steel, and Vigilance. It's the senses shattering conclusion to Deathstroke and Vigilance's battle with the terrorist known as Karrion. After Slade settles the score with his enemy he then heads to Washington to set things straight with Checkmate and the US Government once and for all, and things will never be the same again.