Saiyan History-
Saiyans are human looking beings.The only difference is that there power is superior to humans and they have tails. The saiyan distroyed for enjoyment. The would travel planet to planet and take what they want then distroy it.They came from planet Vegeta with King vegeta as there leader. Until Frieza was sent to there planet to rule the Saiyans by his father Kind cold...And he did.The Saiyans were at there ever camand,but ever time they failed frieza would distroy them. A man named Bardock was tired of it and gathered up the rest of the Saiyans to distroy Frieza. Although Bardock didn't know how strong frieza really was. With just one breath he distroyed all the saiyan except Nappa,Vegeta,Kakorot{Goku} and Goku's brother Raditz, but since Bardock saw his son Goku Straight up with Frieza he died in peace.

Super Saiyan-
There was a legend that many years ago a saiyan got very strong and angry and turned into a Super Saiyan but no one knew if it were true.They only way that they could turn into a Super Saiyan is if they have a very High power level, a pure heart and anger has to come out from within.when you change into a super saiyan not only ur power increases but ur shape does also. Your hair turns pointed and bright yellow and so does your eye brows, And ur eyes turn green blue and lightning strikes around you and then you are complete.Fool blooded saiyans go Super Saiyan,Ultamite Super Saiyan x1, Super Saiyan x3 except for Vegeta that skiped that level ,And Super saiyan x4.Half blooded Saiyan Go Super Saiyan,and Super Saiyan x2.

Also that Gohan ssj4 and vegeta and Goku ssj5 and 6 is fake don't belive it.