20 Amazing Marvel Cinematic Universe Cameos You Never Noticed

18. Nathan Fillion (Guardians Of The Galaxy)

There were all sorts of rumours about Nathan Fillion having a cameo in Guardians Of The Galaxy, with Nova the most popular suggestion as to who he'd play. The Castle star's long awaited debut in the Marvel Cinematic Universe ended up being a lot more nondescript though, and no one would blame you for missing this one! Fillion voiced the CGI alien who messed with Star-Lord in the Kyln and ended up being made an example of by Rocket and Groot.