These Dragon Balls have their own set of Shadow Dragons
Dark Dragon Balls are a set of dark red Dragon Balls with a black colored star. Uniquely each ball possesses the ability to merge with an evil entity to power them up, along with their ability to grant a wish when gathered. If a host of a Dark Dragon Ball is defeated, but the Dark Dragon Ball is not removed in time, the Dark Dragon Ball will cause the host to undergo a Dark Evolution.
It is revealed in the Super Dragon Ball Heroes: Dark Demon Realm Mission! manga that they were created by Demon Gods in order to revive Mechikabura with the aid of a Time Breaker Namekian. After their creation by the Time Breaker Namekian, Towa aims to collect all of the Dark Dragon Balls so that Mechikabura can use them to wish for youth. However, they scatter through space and time before they can be used. The Time Breakers then begin to collect them, coming into conflict with the Time Patrollers along the way.
When all seven are gathered they can be used to summon Dark Shenron.
In Age 762, Future Trunks tries to recover the One-Star Dark Dragon Ball from Frieza: Xeno after he slices him in half but Demon God Towa appears and steals it from him first. In Age 767, after Vegeks: Xeno and the Demon God Gravy briefly align to destroy Cell-X, Putine recovers the Two-Star Dark Dragon Ball.
In Age 774, Demon God Dabura easily overpowers Majin Buu: Xeno holding the Three-Star Dark Dragon Ball but when he lets down his guard, Buu absorbs him and later escapes. In Age 762, Mechikabura along with Salsa and King Vegeta: Xeno confront Turles: Xeno and Mechikabura uses his immense power to destroy Turles: Xeno along with the Tree of Might and collects the Four-Star Dark Dragon Ball.
In Age 774, Shroom defeats Janemba: Xeno holding the Five-Star Dark Dragon Ball but before he is able to claim it, Majin Buu: Xeno arrives and absorbs it along with Janemba: Xeno. In Age 762, whilst in possession of the Six-Star Dark Dragon Ball, Slug: Xeno undergoes a Dark Evolution transformation via Towa's magic in order to defeat the Time Patrollers but when Majin Buu: Xeno arrives and attacks Towa, he is cut down along with Slug: Xeno by Salsa and they recover the Three, Five and Six-Star Dark Dragon Balls.
In the Demon Realm, Broly Dark carrying the Seven-Star Dark Dragon Ball battles against Super Saiyan 4 Goku and Final Form Mira but Mira prevails and recovers the final Dark Dragon Ball. With the full set of Dark Dragon Balls in the hands of the Dark Empire, Mechikabura summons Dark Shenron and wishes for his youth and power to be restored to what it was in his prime.
The Dark Dragon Balls are seen merged with following villains:
- One-star Dark Dragon Ball: Frieza
- Two-star Dark Dragon Ball: Cell
- Three-star Dark Dragon Ball: Majin Buu
- Four-star Dark Dragon Ball: Turles
- Five-star Dark Dragon Ball: Janemba (initially, later absorbed by Majin Buu)
- Six-star Dark Dragon Ball: Lord Slug
- Seven-star Dark Dragon Ball: Broly
- Mechikabura wishes to be restored to his prime.