Time Patrol

The Time Patrol is a group of fighters brought together by Trunks that correct inconsistencies within the main timeline of Dragonball, originally formed to prevent the "Dark Empire" from interfering with time.

History
With Trunks using a time machine to give Goku a medicine for his heart disease, it resulted in Trunks breaking a law of the universe. In order for Trunks to make up for these actions, he works as a time patroller and with Mira's intentions just around the corner at the time, Trunks travels back to Age 1000 to gather allies and stop Time breakers.