While the DCAU Mr. Freeze made some appearances in the comics expanding the lore of the DCAU and BTAS, he was never seen in animation again after his supposed death in that Batman Beyond episode ...

Batman Beyond's heartbreaking deaths include Mr. Freeze sacrificing himself and Warren McGinnis' murder. Joker's death in Batman Beyond: Return Of The Joker traumatizes Tim Drake, highlighting the ...

he understood the assignment when it came time to shoot Batman & Robin. The issue is just that the assignment was way off what it should have been. In the comics, Mr. Freeze is nefarious.