Guardians of the Galaxy has debuted over in Singapore and of course some of the cameos have been revealed from the film (via Stich Kingdom). Some of these will make you laugh and some are just something only director James Gunn would do:
:: Minor Spoilers ::
Otherwise, here’s what we’ve learned: Stan Lee will have his customary cameo, this time as the ‘Xandarian Ladies’ Man;’ browncoat favorite Nathan Fillion will be dolled up as ‘Monstrous Inmate;’ musician Rob Zombie lends his voice as the ‘Ravager Navigator Voice;’ and writer/director James Gunn himself will appear in the film as one of the ‘Maskless Sakaaran.’ Howard the Duck is somewhere to be found in the film. This inference comes from a line in the end titles that credits co-creators Steve Gerber and Val Mayerik. Also in the film, though not a cameo, is actor Fred the dog who assumes the role of Cosmo.Of course we already know Thanos has a "Emperor Palpatine" cameo in the film so that's not much of news.
Guardians of the Galaxy hits here in North America August 1st!