“- Bob Diamond: Being from Earth, as you are, and using as little of your brain as you do, your life has pretty much been devoted to dealing with fear.
- Daniel Miller: It has?
- Bob Diamond: Well everybody on Earth deals with fear - that's what little brains do.”
Rip Torn - Bob Diamond
Albert Brooks - Daniel Miller

“- Ross Jennings: Chris, I'm scared to death.
- Chris Collins: Yeah, we all are, but our brains secrete a neurotransmitter that enables us to deal with them.
- Ross Jennings: I don't think I have that particular neurotransmitter.”
Jeff Daniels - Ross Jennings
Brian McNamara - Chris Collins

“- Ygor: You're going to help him Doctor? You are giving him life?
- Ludwig Frankenstein: Yes but not for the purposes that you think Ygor. I'm giving him strength so that an operation may be successful.
- Ygor: An operation?
- Ludwig Frankenstein: Yes. I'm giving him another brain.”
Béla Lugosi - Ygor
Cedrick Webster Hardwicke - Dr. Frankenstein

“- Ygor: Whose brain?
- Ludwig Frankenstein: Kettering. A man of character and learning. The monster will cease to be an evil influence and become everything that is good.”

Béla Lugosi - Ygor
Cedrick Webster Hardwicke - Dr. Frankenstein

“- Ludwig Frankenstein: Your dream of power is over, Bohmer. You didn't realize his blood is the same type as Kettering's, but not the same as Ygor's. It will not feed the sensory nerves.
- The Monster: Bohmer! You played me a trick! What good is a brain without eyes to see? What good is a brain without eyes?”

Cedrick Webster Hardwicke - Ludwig Frankenstein
Lon Chaney Jr. - The Monster