|First Appearance||"No Mercy"|
|Last Appearance||"No Mercy"|
(Kidnapped by The Man in the end of the episode)
|Series lifespan||"No Mercy" to "No Mercy"|
Harold Teller is a character first encountered in season 3, episode a "No Mercy".
Pre Apocalypse Edit
Before the outbreak started Harold was working with his wife Sarah Teller studying mycologi at Mercy Labs.
Post Apocalypse Edit
Dr. Harold Teller is held up at the compound of Mercy Labs together with a group of survivours.