Legendary Super Saiyan (伝説の超サイヤ人 Densetsu no Sūpā Saiya-jin) is an extremely powerful and rare Super Saiyan transformation. It is a Berserk state with a seemingly endless supply of energy, said to appear once every thousand years.

As of Dragon Ball Super it is generally just referred to as Super Saiyan in its initial stage, and Full Power Super Saiyan when bulked up fully.

It is the Super Saiyan B-type (超スーパーサイヤ人じんＢビータイプ Sūpā Saiya-jin Bī Taipu) of the Broly-type Super Saiyan forms, it is a Super Saiyan which has evolved differently from the graded forms and levels 2 and 3, and is the Final Form of the standard Super Saiyan form, which it is a powered-up version of. Vegeta states that this state may be the “true form” of the Saiyans.

The Legendary Super Saiyan is a being of immense power spoken of in an ancient Saiyan folklore, and Broly’s form is referred to as being the “Legendary Super Saiyan” due to the user’s love of destruction and slaughter – just like the Super Saiyans of legend, and it is noted that perhaps this instinct-driven form is the true Super Saiyan spoken of in legends. It is the true appearance and form of a Saiyan. A user of this form is referred to as a Legendary Saiyan.