These sets are all now bumped back several months with a planned August 26th, 2016, October 28th, 2016, and January 27th, 2017 release.
When the mighty hero falls, his young son Gohan rises up to face the very villains who murdered his father.
The fourth box was originally planned for a May release with the fifth in July and sixth in September, which would have brought the series to conclusion.