“- Champ: What was that?
- R.L. Stine: It's the Invisible Boy.
- Champ: [getting slapped by Brent the Invisible Boy] Ow!
- R.L. Stine: Ah, he's such a crack up.”
Ryan Lee - Champ
Jack Black - Stine

“- Garrett: What are you?
- Devon: Frankly, we're the reason cousins shouldn't marry.”
Cary Elwes - Garrett
Eric Idle - Devon

“You can't kill the man without becoming the monster.”
Gary Leonard Oldman - Dr. Zachary Smith

“Let me tell you a lesson about life, kid. There are monsters everywhere... I know, I am one.”
Gary Leonard Oldman - Dr. Zachary Smith

“The monster's lonely. He wants a friend. A girlfriend. Somebody. What's so sick about that?”
Brendan Fraser - Clayton Boone