User blog comment:Spdr man/Marvel movies/@comment-1895174-20120923015107

Thanos was played by a stunt actor (albeit still a Whedon regular) in The Avengers, so he'll probably be played by a more notable name in Guardians of the Galaxy and The Avengers 2: Electric Boogaloo. Also, I'm pretty sure the GoG movie only exists to serve as the vehicle to introduce Thanos - whose appearances outside of comic books are limited to his cameo in The Avengers, appearances on The Super Hero Squad Show and the short-lived Silver Surfer animated series from the 90's, and some of the Marvel vs. Capcom games - to a mainstream audience.