20 Amazing Marvel Cinematic Universe Cameos You Never Noticed

3. Seth Green (Guardians Of The Galaxy)

Some fans kicked off over the fact that Guardians Of The Galaxy's after-credits scene didn't set up a future movie, but most loved Howard the Duck's bizarre and surprise cameo at the end regardless. While his future in the Marvel Cinematic Universe remains unclear (he probably won't be getting a spinoff anytime soon), it was later revealed that Family Guy star and Robot Chicken creator Seth Green provided the vocals for this fan favourite (although not based on the movie) character.