neobody is right ...
that's another thing in DBZ which isn't correct ... why did Future Trunks have a sword then ??? he had another future (with A17 and A18) ... so he shouldn't have his sword in future, because he never met Tapion
I think this thread should be in Off-Topic, because it's not related with ESF
Answer: He occurs in Movie 13 (The Dragon Fist) ... he came out of a lil music box
he had a monster insie of him (a half monster) which is called "Hildegarn" (in subtitles) ... this monster will be defeated by Goku SSJ3 with the Dragon Fist
*spoiler alert*