Dragon Ball: Yo! Son Goku and His Friends Return!! is a 35-minute short film that was shown at the 2008 Jump Super Anime Tour, which visited ten Japanese cities to celebrate Weekly Shōnen Jumps 40th anniversary [REF].
Another short film, Dragon Ball: Episode of Bardock, was shown at the Jump Festa 2012 event on December 17, 2011 [REF].