We got to see a few minutes of some old friends in The Force Awakens: R2D2 and C-3PO. But the golden droid had a red arm! What’s up with that? We were told the answer would be revealed in a Marvel comic book months ago, but it was delayed. The explanation came out today, a one-shot issue called Star Wars: C-3PO #1. If you want to go buy the comic, you’ll want to skip the rest of this post. Otherwise, here’s the reason that C-3PO has one red arm in the movie The Force Awakens.
You can read more about the story at Gizmodo. In fact, they tell the whole plot of the comic.