Nightmare! That One Tragic Evening in Dressrosa

While Doflamingo continues to control Riku Dold III, his subordinates manage to take control of the castle with the help of an inside spy, who also took princess Viola hostage. With the people's trust in him in tatters, and his spirit broken, King Riku begs for death. Then, Doflamingo appears with his strongest subordinates and defeats the king and his army, setting the grounds for his takeover of the island.
After telling the Straw Hat Pirates of the tragedies of the past, Thunder Soldier explains that the king is still alive since Viola pledged her service to Doflamingo in exchange for the King's life. He, also, explained that although the toys of Dressrosa were once people who despised Doflamingo, they still remember who they were, but not each other and that the drive for revolution is still in them.
In the underground chamber, almost all of the fighters were transformed except for Riku and Chinjao, with the latter having mysteriously forgotten that he had grandchildren.
In the colosseum, Luffy meets up with Zoro and Kin'emon with the help of Bartolomeo, although he was nowhere to be seen.