Death K'nuckles of Catherine was a fusion of K'nuckles and Catherine who performed Ultimate Death Fusion (究極死合体 - Kyūkyoku-shi Gattai). After she was destroyed, K'nuckles become enraged and in anger then Catherine ate him. However, K'nuckles absorbs Catherine then merge into monsterous and mindless form on her body. He and Samuel were sacrificed by explosion. However, Samuel survived and the two of them was ended.
- Death K'nuckles was American counterpart K'nuckles the Master of Death who defeated by Samuel's all weapons and the other weapons not destroyed.