2006 · ソースブック（プレイを拡張するルール／オプション）
Killjoy
This superhero roleplaying supplement presents a pre-generated villain for use with the second edition of Mutants & Masterminds. Once a family man and soldier, William Royce becomes Killjoy after a tragic accident, spreading terror and destruction through a carnival of carnage. The character is designed for recurring appearances or a single encounter and includes game statistics at power levels 4, 8, and 12, supporting grim, realistic, and street-level campaigns.
スキルベース（スキルを購入または獲得）ポイント制（ポイントを割り振ってスキルや能力を得る）属性／ステータス制（STR、CON、PERなど）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。