Captain America: Civil War concept art shows Ant-Man/Giant Man fighting Captain America.

Artist Andy Park has released an extremely cool piece of concept art for Captain America: Civil War that shows that Ant-Man was at one point in the film's production on Team Iron Man (instead of Team Captain America like in the finished product). The piece shows Giant Man (aka Ant-Man's larger form) fighting Captain America. It would have been interesting to see this played out on the big screen but I have to say that I was very happy with the result that we got.

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Source: Comic Book Movie