"When you're hit with a Brainwash Attack, you'll be sent to a place called the World of Mind Control. In the World of Mind Control, you'll face a false version of yourself. Defeating your false self will let you regain control and return to the real world."
The World of Mind Control is a mental realm that appears in Dragon Ball Xenoverse 2.
When a Time Patroller is hit with a Brainwash Attack during Expert Missions, they are transported to the World of Mind Control where they must face off against a doppelgänger of themself, in order to free themself of mind control which allows them to return to the real world.