Big Mouth Wiki
Big Mouth Wiki

Nathan Fillion is a famous actor, best known for his role as Richard Castle from the ABC crime-drama series, Castle. Missy Foreman-Greenwald has a celebrity crush on him and often fantasizes about him being her romantic partner, who goes on adventures through outer space with her. He is voiced by himself.


In "Sleepover: A Harrowing Ordeal of Emotional Brutality", Missy got a massive sugar high and announced that she had a crush on TV's Nathan Fillion. Missy fantasized about riding a giant lizard through outer space with Nathan Fillion. There, Nathan told Missy that he was in love with her but also wanted to stay best friends with her at the same time. Missy was flustered at Nathan's beautiful words, as the hunk of a man continued to tell her that he wanted to spend the rest of his life with her, solving space crimes, doing homework, and listening to Wait, Wait, Don't Tell Me! but first, they danced the merengue because Nathan Fillion has been to Latin America and understands their culture. Missy and Nathan then kissed each other on the lips only for Missy's fantasy to end and for her to find out that she was making out with Jessi's Dog. Devin and Lola recorded her making out with her dog and made fun of her for it. At the end of the episode, all the girls at the sleepover watched Nathan Fillion in Castle, specifically the episode "The Dead Pool". Greg watched the show, stoned out of his mind with Jessi's dog and hallucinated him as Nathan Fillion, telling him that they shot the very scene they were watching day-for-night L.A. from New York.

In "The Planned Parenthood Show", Missy explained how abortions worked with a story called "The Vagilantes", where she was the captain of a space ship, where Nathan Fillion worked as one of her teammates. Nathan Fillion argued with Andrew over who got to go into the woman's vagina to abort her baby but Captain Missy volunteered. At the end of the episode, Nathan Fillion appeared in the cast gathering of the show and Coach Steve thanked him for agreeing to make a guest appearance in the episode.

In "Girls Are Angry Too", Nathan Fillion appeared in Missy's imagination again. In it, Missy thought she would attack Terry Lizer for being a misogynistic creep toward her but Nathan Fillion discouraged her, saying that her non-confrontational behavior is what he finds so attractive about her. At this time, Andrew was cleaning toilets and stupidly tried to insult Nathan Fillion by telling him how big his dick was but this backfired, obviously.

In "Obsessed", Missy wrote an erotic fanfiction about Nathan Fillion getting into a sexual relationship with Gustavo from The Rock of Gibraltar. Jay read it and became very intrigued with the unfinished story and helped Missy complete it.


Nathan Fillion is an adult Caucasian male with brunette hair and dim blue eyes. He is very strong, muscular, and handsome.


Nathan Fillion is a talented actor, who played the role of Richard Castle on Castle. He is also a dreamy, hunk of a man, who is the teenage heart-throb of Missy Foreman-Greenwald.

Episode Appearances