- "Tammy's right. Shit's gotten out of hand. Dante's crew ain't back yet, and she's just leaving them to die. Still refusing to send someone after them."
- —Mr. Harlan talking about Maggie Greene[src]
Not much is known about Mr. Harlan's life prior to or as the outbreak began, except that he lived with his wife and son.
When Carl Grimes defended Sophia and himself from the bullies that previously attacked Brian because of his looks, he immediately showed up at the infirmary, carrying his son and his friend's bodies on a blanket. He then threatened Carl and Maggie along with his wife, saying that the boy should be locked up because of his attack. Although Carl insists it was an act of self-defense, he keeps arguing with Maggie. He finally convinces her of giving Carl some sort of punishment. After that, Maggie sends her him and Tammy to their trailer. He is then seen sitting on a dinner table inside the trailer with his wife and the Rose family. They discuss Maggie's power, and how no one voted or had an opinion on her new occupation; implying that she just began to yell out orders. When start thinking about a way of ending her "reckless" power, Gregory suggests they kill her.
This list shows the victims the man has killed.
- Possibly numerous counts of zombies
- This man's surname was revealed to be Harlan within Issue 140.