Via Starwars.com:

FROM HOMEMADE PROTOCOL DROID TO EWOK GOD AND BEYOND.

See-Threepio, human-cyborg relations. His is a name that has been associated with Star Wars from the very first days and few characters can track their progression as drastically and completely as everyone’s favorite protocol droid. Now, you might think that you have no need for a protocol droid, especially not in an environment such as this, but I assure you he speaks Bocce. It’s like a second language to him. But following this highlight guide to his appearances, you’ll be an expert in what makes him tick.

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