10 Awesome TV Characters Who Only Appear In One Episode

10. Lucille Smith - The Walking Dead

Before appearing in the flesh during the season ten episode "Here's Negan," Lucille (Hilarie Burton) was frequently spoken about, but was more of a plot device than a real person, in place to give Negan (Jeffrey Dean Morgan) a backstory and depth outside of his charismatic, cultist persona. 

When she finally did appear, in a flashback episode detailing the married, pre-apocalypse life of the nefarious Savior leader, Lucille was a tragic, haunting joy, her loving relationship with Negan an emotional high point in a show with many. Suffering from cancer, she gave Negan a reason to live whilst being a powerful, lived-in character of her own. 

That she was played by Dean's own wife made Lucille's debut all the more affecting, injecting her and Negan's calamitous love story with a touching air of authenticity and intimacy. Having her for just one episode was an excellent creative decision, one that packed an almighty punch difficult to shake.