From the wiki regarding DW Fixer
> The hero team known as Dark Watch has gone through a lot. They were originally formed by Expatriette, Setback, and NightMist who were seeking to uncover the truth behind the events of the death of their friend, Mister Fixer. So, it was a bit of a rough start that the first major threat to Dark Watch was a mystically revived Mister Fixer! They managed to survive and even helped him reconnect his mind and body, so Mister Fixer became the fourth member of Dark Watch, fighting alongside those who risked everything to save him.
What they found, however, was not exactly what they were looking for. They learned of the death of Mr. Fixer at the hand of his old pupil, The Operative, but his corpse had been sent to the fabled Temple of Zhu Long. The three heroes fought their way to that temple, only to be forced to face in combat the very subject of their search. A resurrected Mr. Fixer who knew not the faces or voices of his former allies fought them at the command of the mystical Zhu Long. In the course of the battle, NightMist managed to reconnect Mr. Fixer’s mind to his body, and the four escaped the temple together.
Now, Mr. Fixer fights as part of Dark Watch. There is much unknown about how he returned, and his body seems to be healthier and stronger than before, but he still experiences great, undying rage. He is a harsher combatant than ever before, and the other members of Dark Watch keep their eyes on Mr. Fixer, both concerned for his safety as well as their own.
So if we assume that the Operative death thing has already happened via the DW Fixer unlock, then maybe something like having Setback, Exp, Nightmist, and Fixer on the team, maybe have Fixer die and get resurrected? And then maybe after that Nightmist plays Enlightenment on him? (It's about the only helpful thing Nightmist can do to someone else, and it says she reconnected him). Obviously you'd need Temple of Zhu Long, but maybe the villain wouldn't matter? I mean, sure, you could say it has to be Chairman so Operative can kill Fixer, but again, seems like you're redoing DW Fixer at that point.