The conflict in the story behind Dragon Ball Online is fueled by the Time Breakers, spearheaded by a villain named Mira, who has also enlisted remnants of the Frieza Force and a human faction known as the Red Pants Army.
The motives of Mira involve obtaining the DNA of legendary figures like Goku and Freiza, and achieves his greatest goals through time travel and mind control.
Mind controlled victims of Mira are characterized by a green gem placed on their forehead, and his minions range anywhere from cyborgs to mind-controlled Great Apes.
After using the Time Machine to defeat the Androids and Cell, Trunks was warned by the Lord of Time for his actions in breaking the law of the universe by time traveling and creating alternative histories which could lead up to the destruction of universe.
He also informed Trunks of Mira’s threat, creating destruction through universe by illegally time traveling. After learning this, Trunks takes up the job as a time patrolman to correct his wrongdoing, and stop Mira. He set off to the past and warned Dende and Piccolo of Mira’s threat.