There are plenty of mysteries in Star Wars: The Force Awakens and one of them involved iconic droid C-3PO. In case you didn’t notice, C-3PO had a red left arm instead of his usual gold-colored arm. This mysterious change was totally unexplained in the movie itself and we’ve never had any answer for it… until now.
Per iO9, the first issue of the new Marvel comic Star Wars: C-3PO #1 offers details about how C-3PO got his not-so-shiny new red arm. Spoilers obviously follow below.