Super Saiyan 9001

Super Saiyan 9001 is the form that a Super Saiyan reaches after reaching Super Saiyan 9000. A user of the Super Saiyan 9001 form's power is doubled by compare to the Super Saiyan 9000's power.

The first character to reach this form was Ghost Nappa, during his battle with Baby Buu(Hyper Gogeta, Gotenks, and Gohan absorbed). Ghost Nappa was able to defeat him in mere minutes after using this form.

Shortly before his 72nd death, Goku also transformed into this form against Earth Jarius, enabling him to sucessfully defeat Jarius. However, the victory was hollow, as Namek Jarius decided to head to Earth shortly after the incident to finish the job his spawn tried to do.

It should be noted that the user dies shortly after using this transformation, as the energy release on the body destroys it inside-out in about 15 minutes. Ghost Nappa was able to survive due to lacking a body.

Later, after his 75th ressurection, Goku learned how to keep his spirit in place during the use of this form while transporting his body elsewhere, making it possible for him to survive the transformation. However, this greatly weakened the transformation.