
1) Fictional engineer 2) Fictional mad scientist 3) Horror film villain 4) Stock character
Found on
https://www.crosswordclues.com/clue/mad-scientist

In fiction, a mad scientist (also called a mad engineer or mad professor) is a professor, scientist, or engineer who is considered `mad` – a synonym for insane. The mad scientist may be villainous or antagonistic, benign or neutral; may be insane, eccentric, or clumsy; and often works with fictional technology or fails to see potential objecti.....
Found on
http://en.wikipedia.org/wiki/Mad_scientist
No exact match found.