OK. Another themed quote contest. Every quote has two commonalities: they all feature the same word. That word has been blanked out in each quote. They're in order of difficulty. The quotes are worth a point, and so is the mystery word.
1) "And I'm his good friend ______!"
2) "I feel like I was mauled by ______."
3) "So, you guys don't believe in Robot ______?"
4) "Sweet Zombie _____!"
5) What is the mystery word?