Possible Clues:

• Humpbacked helper of film
• 'Prince --', opera by Borodin
• Prince married to Yaroslavna, in opera
• Helicopter designer Sikorsky
• Cinematic lab assistant
• Pet bat on 'The Munsters'
• Memorable lab assistant
• Stock horror film servant
• "What hump?" lab assistant
• Borodin opera "Prince ___"