Marvel Studios delivers the ultimate comic-book production, tying such characters as Iron Man (Robert Downey Jr.), Captain America (Chris Evans), The Hulk (Mark Ruffalo), and Thor (Chris Hemsworth) together for a big-screen franchise team-up like no other. Show runner Joss Whedon (Buffy the Vampire Slayer, Firefly) adapts and helms the script by Zak Penn, with a supporting cast that includes Samuel L. Jackson and Jeremy Renner. – Jeremy Wheeler, Rovi (Source)
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