Battle Against Cure Flower
In the past, Dune has fought against many generations of Pretty Cure, though it is not said whether he defeated them or not. What is told by Kaoruko, however, is that they fought several times before Cure Flower used the Heartcatch Mirage, sacrificing her position as Pretty Cure to end the battle in a draw. However, Dune saw it as a defeat, and fell into deep sleep to restore his power. In his absence, he let Sabaku and his minions battle the later generation of Pretty Cure, Cure Moonlight.
During his return at the awakening of the third fairy, he gives new orders to Sabaku from his private asteroid, heading to Earth to eradicate the Cures. Later noticing that Pretty Cure are getting stronger day by day, he gives Sabaku three Dark Bracelets to power up the three minions.
Arriving at Earth
Dune arrived at Earth and sent a Desert Seed down to Earth which quickly turned into a Desert Devil. The Desert Devil was defeated by the Pretty Cures with the aid of the newly aquired powers, the Super Sillouhette. At christmas Dune returns to earth and is after the power Cure Flower sealed of his from their battle. The Cures attack Dune seemingly getting the upper hand. As the dust settles Dune is still standing and then goes on the offensive against the Cures. Taking out Moonlight first quickly followed by Sunshine and Marine he then turns his attention of Cure Flower. Cure Blossom tries to stop him but is unsuccessful and also falls to his power. Dune and Cure Flower then fight but she also is no match for him in her weakened state and defeats her. Leaving for his fortress with Kaoruko the Cures are left defeated and unconcious. He then proceeds to regain the power Cure Flower sealed away in her necklace by breaking the necklace. The great heart tree then arrives and Dune shatters the barrier protecting it and forces Kaoruko to witness him make the great heart tree wilt fully. However this did not break the spirits of the those who had been purified by the Pretty Cures allowing hope to still exist and furthermore allow the Cures and their fairies to retain their powers regardless of what he had done to the tree.
The Final Battle
Dune arrives shortly after Dark Cure's defeat and begins to battle her Sabaku, Moonlight joins the fight protecting her father from a barrage of energy shots from Dune. Blossom joins the fight only for Dune to create a dark energy bomb which explodes breaking the Pretty Cure transformation and leaving all 3 on the ground. As Dune prepares to do the same Yuri's father runs to the dark energy and uses himself to shield his daughter and Tsubomi from the explosion. He tells Yuri to look after her mother and as Yuri runs to her father the energy explodes leaving only taters of her father clothes. Enraged by Dunes actions Yuri prepares to engage him in battle only for Tsubomi to grab her arm begging her not to fight with anger and hatred. Yuri tells Tsubomi she dispises Dune cos thanks to him she has lost Cologne and her father. Tsubomi remind Yuri that the Yuri she looks up to would never fight out of anger and would not be willing to do what she is about to and gives Yuri the remains of her heartseed that Dark Cure possessed, helping Yuri remember that Pretty Cures fight with love. The two transform into Moonlight and Blossom and begin to battle Dune. Just managing to keep the battle equal between them until Dune shoots dark energy at them which exploded on impact. As the dust settle Marine and Sunshine are revealed to have saved them from the attack and they join Moonlight and Blossom in fighting Dune. All the cure use there Forte Wave attacks against Dune followed by Marine and Sunshine combining to use Floral Power Fortissimo and Moonlight and Blosssome to combine to use the same. All four hit dune at the same time and then call fourth the Heartcatch Mirage and use Heartcatch Orchestra against Dune.
- During a transmission to Sabaku and Dark Cure, a dark coloured creature can be seen on Dune's left shoulder. It is unknown what this creature is or if it is merely part of Dune. It is possible it could be similar to the fairies and is what grants him is power. Its origins are also unknown.
- Even after 50 years it would appear Hanasaki Kaoruko still has a connection with Dune, as she can feel he is returning. This connection could be explained with the fact Cure Flower sealed his powers and it is that which is what connects the two.
- Dune is the only villain in the Pretty Cure Universe who can become a planet-sized being, only been beaten by the Movie Villain Black Hole.