Who played the monster in Young Frankenstein?

To name just the main ones:

Dr. Frederick Frankenstein- Gene Wilder

Igor- Marty Feldman

Inga- Teri Garr

Elizabeth- Madeline Kahn

Inspector Kemp- Kenneth Mars

Frau Blucher- Cloris Leachman

And a few secondary ones that I think deserve a mention as well:

Herr Falkstein- Richard Haydn

Mr. Hilltop (the unfortunate man that Freddy knees in the groin to demonstrate involuntary nerve impulses)- Liam Dunn

The Blindman- Gene Hackman