Mister Freeze had not taken sides before, nor had he been controlled.
Whether it was Jack or Joker, their method of using the Mind Control headband was to first control Clayface, then use him as a catalyst to enter each person's body and transmit the controlling brainwaves remotely once more.
Mister Freeze's armor had a fully enclosed helmet, and it was made of diamond—extremely sturdy.
However, amid the city's series of changes, the massive tank he used to freeze his wife had shattered, leaving her life hanging by a thread.
He himself might have been unafraid of death, but his wife was his absolute weakness.
Batwoman was skilled at exploiting other people's weaknesses, even if such behavior seemed far from honorable, perhaps even somewhat despicable.
Even so, after the two knights found Mister Freeze, he traded his intelligence and assistance for a set of Final Machine medical services.
The Final Machine could not cure his wife's terminal illness, but it could keep her body functioning for a few more weeks. That also meant the patient had to remain on it and receive constant maintenance.
Promethium was extremely valuable. Judging by Earth-0's black-market prices, the raw materials for the Final Machine alone were worth over a hundred million US Dollars, not to mention its intelligent equipment and medical diagnostic programs.
In other words, Batwoman had handed Mister Freeze several hundred million US Dollars just to secure his help once.
Fortunately, she had Money Ability.
"Thank God, her heart rate has recovered. Thank you for everything you've done." Inside a hidden warehouse was a temporarily sealed sterile ward. Within it stood the Final Machine, freshly assembled, its metal still gleaming coldly.
A woman lay quietly atop the machine, an oxygen mask covering her face. Judging from the monitoring equipment beside her, aside