Super Saiyan level 1 Vegeta: When he was training in space Goku: When Krillin gets killed by Freeza Gohan: During the training in the Room of Spirit and Time Futere Trunks: When Gohan gets killed by the androids (#17 and #18) Chibi Trunks: Sometime befor the world martial arts toernament Goten: When he trains with Chi-Chi Gotenks: He was it always (becouse Goten and Trunks already SSJ were) Broli: I'm not sure of it was from birth or when his father was at the point to die

Super Saiyan level 2 Goku: When he was training in the otherworld (or heaven or hell, I don't care) Vegeta: When he became Majin Vegeta Gohan: When the head of Android #16 gets smashed by Perfect Cell

Super Saiyan Level 3 Goku: when he trained in the Otherworld (again) Gotenks: During the training in the Room of Spirit and Time

Super Saiyan Level 4 Goku: When he fought Bebi on New planet Plant he became Golden Oozaru and then he could turn into SSJ4 Vegeta: Bulma made a divice called the brute ray, that thing can make a Saiya-Jin reach Level 4, and used it on Vegeta, so he cheated this level