If you haven't seen Guardians of the Galaxy yet and don't want the post-credit scene spoiled… go away.

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Okay, I'm very serious here… Get out now if you don't want to know the surprise at the end..

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Most of you have probably already seen it and know that the movie ends with a beaten up Collector (Benicio Del Toro) having a drink with one Howard the Duck. Well according to multiple sources including the Nerdist, the voice of said duck was played by Robot Chicken co-creator and Family Guy voice actor Seth Green.

There is speculation that the role had been offered to Nathan Fillion but the actor passed in hopes of landing a larger role in the Marvel Cinematic Universe later on… but again, that is speculation based on comments from director James Gunn.

Howard of course is infamous in the film world for being one of the biggest theatrical flops of all times thanks to the George Lucas' 1986 movie.

As for how important the appearance of Howard was…

.@eonline @Isaac_O_C_A The end tag was just me having a bit of fun. At the end of the day, we don't take ourselves too seriously. — James Gunn (@JamesGunn) August 1, 2014