13 Best Secret Cameos In Marvel Movies

9. Seth Green - Guardians Of The Galaxy

As well as acting and directing, Seth Green is probably best known now for voicing Chris Griffin on Family Guy and as the man behind Robot Chicken, but he's a lot more recognisable than your usual voice artist.

He's obviously also got friends at Marvel Studios as he turned up in Iron Man 2 playing himself and then returned for a voice-only cameo in Guardians Of The Galaxy's post-credits stinger. The fact that he managed to make Howard The Duck seem like more than just a bad Hollywood memory was beyond impressive.

Naturally, he returned for Vol 2 as well, but there are no plans for a Howard stand-alone movie just yet.