Kill the Oozaru (Great Ape) inside of you (without cutting off your tail) to become a "Mega Super Saiyan" (or Mega Saiyan). This results in your power being multiplied by 2000 times your normal form. Achieved by: The first one to use it was Trunks, but Goku is the one who used it the best. This form has many different stages. It was said that this form rivals Infinty Super Saiyan; however, it was later proven to be weaker than Super Saiyan 5.