Christopher Lee Yost is an American film, television, animation, and comic book writer best known for his work for Marvel Studios' Marvel Cinematic Universe with Thor: The Dark World (2013) and Thor: Ragnarok (2017) and on The Mandalorian for Lucasfilm and Disney+.

Thor: The Dark World is a 2013 American superhero film based on the Marvel Comics character Thor, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. It is the sequel to Thor (2011) and the eighth film in the Marvel Cinematic Universe (MCU). The film was directed by Alan Taylor from a screenplay by Christopher Yost and the writing team of Christopher Markus and Stephen McFeely. It stars Chris Hemsworth as Thor alongside Natalie Portman, Tom Hiddleston, Stellan Skarsgård, Idris Elba, Christopher Eccleston, Adewale Akinnuoye-Agbaje, Kat Dennings, Ray Stevenson, Zachary Levi, Tadanobu Asano, Jaimie Alexander, Rene Russo, and Anthony Hopkins. In the film, Thor and Loki (Hiddleston) team up to save the Nine Realms from the Dark Elves.