Since S.H.I.E.L.D. was first announced there have been endless suggestions for potential cast members and guest appearances. Naturally with the strong following Joss Whedon has, many of those suggestions involve people that have worked with Whedon before. We have put together 5 of our S.H.I.E.L.D. guest star suggestions. For the most part we went with those we know can pull off humor as well as drama. We didn't include any of the "Avengers" because that would take up our whole list but it would make sense there may be appearances from them leading up to movie releases. We would love to hear who would make your list.