ドラゴンボールＺ 龍拳爆発!!悟空がやらねば誰がやる

The Z Warriors discover an unopenable music box and are told to open it with the dragon balls. The contents turn out to be a warrior named Tapion who had sealed himself inside along with a monster called Hildegarn. Goku must now perfect a new technique to defeat the evil monster. (Source: Anime News Network)