This is the newest part of the Dragonball saga. Unlike the previous Dragonball and Dragonball Z adventures, Akira Toriyama did not participate in the making of this series. Alot of strange things happen in DBGT. For example, we find out that there is another Super Saiyan level (Super Saiyan 4, if you consider it a leel of Super Saiyan). The story line reverts back to that of the original series. Goku starts off in a quest for the Dragon Balls again, but at a much larger scale (implied in GT - Grand Tour). Instead of searching for Dragon Balls spread across a planet, Goku searches for Dragon Balls across the entire universe.