Doctor Frankenstein appears in SLASH'EM along with his monster on his level in Gehennom. His attacks can cause teleport in the manner of a quantum mechanic. He is guaranteed to carry a lab coat, a wand of polymorph, and a spellbook of polymorph.
Somewhat like the other denizen of a second up staircase in Gehennom, Doctor Frankenstein is quite weak for the part of the game in which one meets him. He does a non-threatening amount of physical damage, and his special attack is merely an annoyance, which is mostly nullified by magic cancellation anyway. He is somewhat hard to hit, but no more so than a disenchanter.