Via Kotaku.com:
Famous droid C3PO had a red arm In last year’s Star Wars The Force Awakens. The reason why was explained in a Marvel comic in April and then acted out in a bonus game level added to The Lego Star Wars The Force Awakens in August.

The level is called “The Phantom Limb” and so far is only out for PS3 and PS4. That really stinks for everyone who doesn’t have a PlayStation, since it is both a good addition to Star Wars lore and a minor breakthrough in Lego game level design.

In terms of lore, it replicates the story told in the comic. C3PO and a group of other droids have crashed on the planet Taul. Among them is the malevolent, chrome-plates protocol droid O-MR1, who works for the First Order. He taunts C3PO about the prospect that the famous golden droid may have also worked for the bad guys once and then had his memory wiped. But C3PO is used to talking back.

“I feel quite certain that I have never associated with anyone who turned evil,” C3PO replies, as oblivious to the revelation in the Star Wars movie prequels that Anakin Skywalker built him as so many of the rest of us wish we could be.

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