2009年10月6日発売「『今日の5の2』宝箱」に封入のOAD。テレビアニメ版のキャスト・スタッフが再結集して製作された『今日の5の2 放課後』全4話を収録したほか、『みなみけ』とのコラボレーションしたボイスドラマが同梱されている。
Based on the smash video game series by Double Fine Productions (Psychonauts, Broken Age) and the world originally created by Tasha Sounart, Costume Quest is a funny and mysterious animated series aimed at six to 11-year-olds. The show stars four kids facing off against the dark forces lurking in the shadows of their sleepy town of Auburn Pines. To overcome obstacles and achieve their goals, they must learn to unlock and master the magical powers of super-normal costumes-with each costume comes a new set of transformations and powers.
天才威的怪兽计划失败后他将回归全新画质升级的动画片《熊出没：怪兽计划2》的狗熊岭，在他可爱但狡猾的小助手的陪同下，天才威开始重新搜集碎片继续收集能量石的碎块继续与贯穿全系列的“熊强”联手开启一场新的“无敌怪兽保卫家园”的森林战争。
