The San Diego Comic-Con 2011 Exclusive The Avengers Mini Mighty Muggs Collector’s Pack includes five figures - 4 Mini Mighty Muggs [Hulk, Thor, Iron Man and Captain America] and a regular size Mighty Mugg Giant Man.
I really like the packaging - Giant Man's head sticking out of the box.
Mini Iron Man
Mini Captain America
And for The SDCC Spider Man Mighty Mugg - What makes this different from the previous Spider Man Muggs is its removable cloth mask.