Words can't express what this man means to the anime, his name is Goku. The true Saiya-Jin, the main good guy, the strongest Saiya-Jin, all these names are fit for Son Goku. I could go on expressing how strong he is all day, but let's cut to the chase. Goku first went Super Saiya-Jin in a battle with Freeza. Freeza nearly killed Piccolo, and then killed Goku's best friend Kuririn. Anger was the key to the first Super Saiya-Jin transformation. Goku erupted and turned Super Saiya-Jin. He won the battle with Freeza. After Cell announced that the Cell Games would occur, Goku left to train in the Room of Spirit and Time. While in there, he achieved the state of Ultimate Super Saiya-Jin. He vowed never to use this transformation though, because it took too much of his strength to use. Goku then set off to face Cell, but was unsuccessful. After the Cell fight, Goku was dead. He trained very much in the afterlife with the gods. While training, Goku reached Super Saiya-Jin 2. Super Saiya-Jin 2 is probably the stage we see the least of Goku in, considering he remains in the afterlife for quite a while. Years later, Goku still remains in the afterlife, training hard as usual. We don't see this transformation, but we know it happens. Goku reaches the unknown stage of Super Saiya-Jin 3. Goku was granted the ability to be able to come back to Earth. When on Earth, we get to see the great transformation for the first time, his opponent being Fat Buu. We all know the story. Goku fuses with Vegeta, they beat up Super Buu. Then Kid Buu is born. Kid Buu seems invincible. Goku then uses his trump card, the Super Genkidama. It kills Kid Buu and the universe is at peace. Then in Dragonball GT, Goku reaches the ultimate stage, Super Saiya-Jin 4. During the battle with Bebi-Vegeta, Goku is furious. To top everything off, he sees his daughter Pan crying. Goku erupts, becomes Golden Oozaru, then becomes Super Saiya-Jin 4. He kills Bebi-Vegeta and saves the day. Goku goes Super Saiya-Jin 4 to save the day many times in Dragonball GT, the last time he does is to fuse with Super Saiya-Jin 4 Vegeta and become Super Saiya-Jin 4 Gogeta. Goku never failed in the entire anime, Goku is truly the ultimate Saiya-Jin.