This issue is a variant of The Mighty Avengers (Marvel, 2007 series) #1. There exist further variants.
part of "The Initiative" crossover storyline
in Mighty Avengers: The Ultron Initiative (Marvel, 2008 series) #[nn] ([August] 2008), #[nn] ([August] 2008)
in Mighty Avengers: Assemble (Marvel, 2009 series) #[nn] ([March] 2009)This second print variant utilizes the splash page art as the cover image.
in Mighty Avengers: The Ultron Initiative (Marvel, 2008 series) #[nn] ([August] 2008), #[nn] ([August] 2008)
in Mighty Avengers: Assemble (Marvel, 2009 series) #[nn] ([March] 2009)
in Avengers Unconquered (Panini UK, 2009 series) #9 (September 2009)
in Avengers: I Am an Avenger (Marvel, 2010 series) #[1] ([May 2010]) [[paperback]]