<Tr> <Td> Vegeta Saga I </Td> <Td> April 12, 2005 </Td> <Td> 1--21 </Td> </Tr> <Tr> <Td> Vegeta Saga II </Td> <Td> March 21, 2006 </Td> <Td> 22--27 </Td> </Tr> <Table> <Tr> <Th> Name </Th> <Th> Date </Th> <Th> Discs </Th> <Th> Episodes of dragon ball z </Th> <Th> Sagas </Th> </Tr> <Tr> <Td> Season One </Td> <Td> February 6, 2007 </Td> <Td> 6 </Td> <Td> 1--39 </Td> <Td> Vegeta Saga </Td> </Tr> <Tr> <Td> Season Two </Td> <Td> May 22, 2007 </Td> <Td> 6 </Td> <Td> 40--74 </Td> <Td> Namek / Captain Ginyu Saga </Td> </Tr> <Tr> <Td> Season Three </Td> <Td> September 18, 2007 </Td> <Td> 6 </Td> <Td> 75--107 </Td> <Td> Frieza Saga </Td> </Tr> <Tr> <Td> Season Four </Td> <Td> February 19, 2008 </Td> <Td> 6 </Td> <Td> 108--139 </Td> <Td> Garlic Jr. / Trunks / Androids Saga </Td> </Tr> <Tr> <Td> Season Five </Td> <Td> May 27, 2008 </Td> <Td> 6 </Td> <Td> 140--165 </Td> <Td> Imperfect Cell / Perfect Cell Saga </Td> </Tr> <Tr> <Td> Season Six </Td> <Td> September 16, 2008 </Td> <Td> 6 </Td> <Td> 166--194 </Td> <Td> Cell Games Saga </Td> </Tr> <Tr> <Td> Season Seven </Td> <Td> November 11, 2008 </Td> <Td> 6 </Td> <Td> 195--219 </Td> <Td> Great Saiyaman / World Tournament Saga </Td> </Tr> <Tr> <Td> Season Eight </Td> <Td> February 10, 2009 </Td> <Td> 6 </Td> <Td> 220--253 </Td> <Td> Babidi / Majin Buu Saga </Td> </Tr> <Tr> <Td> Season Nine </Td> <Td> May 19, 2009 </Td> <Td> 6 </Td> <Td> 254--291 </Td> <Td> Fusion / Kid Buu Saga </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th> Date </Th> <Th> Discs </Th> <Th> Episodes of dragon ball z </Th> <Th> Sagas </Th> </Tr>

How many seasons of dragonball z are there