Dragon Ball Z is one such show. On February 26, 1986, the first adaptation of the Dragon Ball series was released. Three years later, a spin-off series was released - Dragon Ball Z. There have been many different spin-offs of the show, but each one has managed to captivate both children and adults. Like any show, though, the creators have hidden some things from the audience. Truths that they don't want viewers to know and prefer to just keep a mystery or hidden. Here are some of those secrets.